PDF malware analysis — malicious · 900f949d820e55d8

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 18:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e9cc7a9d52f81dd2e6dad18c4c85a6c0 SHA-1: c3e4cb230a89e61b0f3df09af2b7bfcf583cf394 SHA-256: 900f949d820e55d87d18aa4888899ef4a14fd46254c0ffa99637c9c01eb5c046

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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 http://dent-pro.cz/pic/file/53260313705.pdf In PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083036e1323d---leminotis.pdfIn PDF document text
- https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/puh73rdenjqul8dc9bdedaf276/wigukikidebimurosidu.pdfIn PDF document text
- http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/82784895030.pdfIn PDF document text
- https://www.willmarareachamber.com/ckfinder/userfiles/files/18561396760.pdfIn PDF document text
- http://prochem.vn/images/uploads/files/xilasuwisup.pdfIn PDF document text
- http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/xezebiniwogaxedepopizowas.pdfIn PDF document text
- http://jl-vacuum.com/upload/files/paxofelerusaxe.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8c87b8c9fcfef5d4baa64dfc69a8942/58251465443.pdfIn PDF document text
- http://evo-models.com/uploads/userfiles/files/guvojuvupuxesijukesugelun.pdfIn PDF document text
- http://canadianrockies.info/files/file/donokezi.pdfIn PDF document text
- https://acgroupenterprise.com/userfiles/file/buvabedurapemej.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/54rkcd5ve27votnc464v0c11f6/kozufexopimonufowabipaj.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608187f429c87---68335534788.pdfIn PDF document text
- http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/towegusebaraludike.pdfIn PDF document text
- http://lso-msm.fr/userfiles/file/xexesomizozup.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7h8h6p7f2ciejeglcb2b1atp4k/nozibozanevumusewidi.pdfIn PDF document text
- https://mrdak.cc/uploadfile/files/dazavobemuzadibora.pdfIn PDF document text
- https://hrmconsulting.biz/upload/files/88400791057.pdfIn PDF document text
- https://braindevelopmentmaps.org/userfiles/files/nujukukadozavodefet.pdfIn PDF document text
- http://shinex-auto.com/userfiles/file/zojarik.pdfIn PDF document text
- http://anvlaw.com/userfiles/file/zozawaf.pdfIn PDF document text
- http://jaatkinson.com/userimages/pebix.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1d8ad2bdad5f67a552682c6fc14201f5/58062113749.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=default+database+collationPDF 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_off0000e4cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4CB	10612 bytes
SHA-256: `7cacc7ba2d3aa20934c3c6a8dcd760bbdefd31fbb4b13cf407597a672961071b`
`font_01_sfnt_off0000fd28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD28	18672 bytes
SHA-256: `da95739ac21744a4bda03cd5571543f79a0eec22c9cc1535d8a4a7422b6899cc`
`font_02_sfnt_off00012d91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D91	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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