PDF malware analysis — malicious · 8c396111327c8a63

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 03:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 03b21d00ba2c82759af61524aadde35c SHA-1: ebc31bbb89196a54195452ad3e547566f568caa8 SHA-256: 8c396111327c8a631a6fe49c11e18ac117e534d75a4a1204cd340dba335a3e04

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware. The presence of a download button lure further supports a phishing or malware distribution motive. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 9

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://naoshima-habitant.com/88202579786.pdf In PDF document text
- http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae328bf635---jafumepefedaguzake.pdfIn PDF document text
- https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297eacf85e---67349545060.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e4608b663---bubixufejolipipe.pdfIn PDF document text
- https://fenixfalt.com/userfiles/file/64080791103.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405c2a83a0---vabafe.pdfIn PDF document text
- https://edarky.net/data/file/zojatodelabowubinonowofo.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be636f40e3f---tezavedeselofugira.pdfIn PDF document text
- https://aradmissions.com/ci/userfiles/files/noxuletaregekop.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84494d648---vagugezojadunipifevifow.pdfIn PDF document text
- https://delcinfo.ru/img/files/files/23979516361.pdfIn PDF document text
- http://boxethai38.com/upload/file/37451012042.pdfIn PDF document text
- https://2-view.org/home/view/public_html/ckfinder/userfiles/files/87597207471.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4e8bf4527d216e47e65c70f7045ad5c9/16958440592.pdfIn PDF document text
- http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/66993160677.pdfIn PDF document text
- http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210503143532381081ykyoxy.pdfIn PDF document text
- https://serka.com/serka/upload/files/84719045331.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160761235295eb---6918547700.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/33082510742.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/1f5476a4e7614e565b3219a7ee8ac76a/tenafapigudaremijomisaz.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f64nlf75qa2a1duduc046dd0j2/42059856859.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/768b4db52d3ba24af92a5f5fcd407584/xutalesivupoz.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a1a1d032---39780499661.pdfIn PDF document text
- http://marthomaiticherukole.com/userfiles/file/83441653623.pdfIn PDF document text
- http://55pluscommunityspecialist.com/userfiles/files/lupamuzome.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f20c8873a9---3175598683.pdfIn PDF document text
- http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apowermirror+for+pc+with+crackPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010541.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10541	10588 bytes
SHA-256: `89be9e37859ded686485060e36e91b7b6c176d2dc336fdbf6ef4f390ca7a356c`
`font_01_sfnt_off00011d8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D8C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001359e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1359E	17024 bytes
SHA-256: `29ab8c646d459ce93db30b67a93b4be84cc932bc31d06ec9984010b5f5857ccb`

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