PDF malware analysis — malicious · e9489d17d2d5b4fd

MALICIOUS

PDF

91.4 KB Created: 2021-09-01 01:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 375c47600e6fb45eecd01e5f42d12b1c SHA-1: 0888b3b76d022484106465646749cefaf00d0d85 SHA-256: e9489d17d2d5b4fd6dd56c8d0583694cf1f2d8e038a4384896abc475543f3ba5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded JavaScript stream and URI heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
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://crewmak.ru/uplcv?utm_term=ang+meaning+in+english PDF link annotation
- http://banglatalkies.com/dynamic-images/cms/file/xalomuridumudexowefuzo.pdfIn PDF document text
- http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210719050729489753yg0szl.pdfIn PDF document text
- http://usmleworkout.com/files/file/84270664005.pdfIn PDF document text
- https://happycolaborativo.com/uploads/files/11959991428.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d6e09cd564a04bf4a1fe8697f43d9c73/60201605397.pdfIn PDF document text
- https://cecprint.com/images/file/5065898469.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607394b1794a4---91089854775.pdfIn PDF document text
- http://gestmase.com/media/images/file/4885695091.pdfIn PDF document text
- http://tk-weld.com/images/library/File/vapupusegarazig.pdfIn PDF document text
- http://kleinschaden.expert/userfiles/file/65670759411.pdfIn PDF document text
- https://igruppe.no/ckfinder/userfiles//files/demalasenapoja.pdfIn PDF document text
- http://gediklimakinahidrolik.com/resimler/files/96225518855.pdfIn PDF document text
- http://feynburg-uhren.de/uploads/votewajiv.pdfIn PDF document text
- https://dotcomtravelegypt.com/userfiles/files/99681969572.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ff094143---22624052696.pdfIn PDF document text
- http://ckrestaurantgroup.com/ckfinder/userfiles/files/14250108902.pdfIn PDF document text
- http://v-lukomorie.com/uploader/files/libirenoruwataxeru.pdfIn PDF document text
- http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/jejomixasu.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8209c7d72f7d2d0bcf8dae5cda705879/nijaxisejuwinukivubi.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2780k0bcqqk1cf3otnlqss117q/tuwujujavigozerego.pdfIn PDF document text
- http://robertfeinberglaw.com/images/edit_images/file/3791955682.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/070739a6b57b987b8c0c4fe8c85a99a3/jajitogobil.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070046103401---72819038114.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/35c90fe333ac9c276733a3749fdf4cc4/13874248029.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e121.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE121	21772 bytes
SHA-256: `d5952b06af0c68f2f7c215c5cd518893d24faad34d50dad23403733c867a548c`
`font_01_sfnt_off0001182f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1182F	10220 bytes
SHA-256: `a87d5f9b05c9c9a9a12484659c40b4812e9a8496842364d357c2b966b776d8a9`
`font_02_sfnt_off00012ed9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED9	16376 bytes
SHA-256: `71df62cfdf0c8485b34d516449eb1d4c0639bc50d0590655dc268e90cc95784d`
`font_03_sfnt_off00014557.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14557	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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