PDF malware analysis — malicious · 401e79fd9db09867

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 03:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: bb5135a0402feba14a4f93075bd6c7c6 SHA-1: 70a93a6735e46dec8fd46f471a25ab783db63d47 SHA-256: 401e79fd9db09867843fef3d33afced61bf540037aa99bc739f906113d880b62

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised websites, likely serving as a lure for users to download further malicious content or engage in phishing. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://wastran.ru/uplcv?utm_term=tributaries+of+river+cauvery PDF link annotation
- http://somogroup.vn/ckfinder/userfiles/files/16059364226.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6376c40d51---mikajomobusorelafuj.pdfIn PDF document text
- https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0c6abish9r3d6c80dorpqefuf1/68077902653.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/vkkbg85sndgln36ip4o7n83590/17486497870.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q2pcvesmnm5iub2sg2vu90igui/gotodigopuwakatupupalis.pdfIn PDF document text
- http://nw-line.ru/generic/uploaded/49922502163.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1302e28cb2---jefala.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0f4665abe0b3926e9d17390d55042f40/98783846716.pdfIn PDF document text
- https://plasy.com/uploads/file/fufalenujeduse.pdfIn PDF document text
- http://latexindia.com/userfiles/file/60454431163.pdfIn PDF document text
- https://aljuboori.com/userfiles/files/titek.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14c82c967---sanimug.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/029a28ea45319e698cfa311809e07ac3/92856257157.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607103379a291---jumijomoxovukorizozogugog.pdfIn PDF document text
- https://geneolock.com/locktactyuma/userfiles/file/4348972830.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b820cd8427f---90964470005.pdfIn PDF document text
- https://bandotrading.com/uploads/file/95850896186.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097e83dcb023---kasoxumurakenuzudi.pdfIn PDF document text
- http://pc75.net/upfiles/file/1624347126.pdfIn PDF document text
- http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/26348084480.pdfIn PDF document text
- http://atol-res.pl/uploads/file/28785151217.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcacd49056---xawiwuvewujexerosarixo.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16084cde54c110---49900687661.pdfIn PDF document text
- https://stiff.pl/ckfinder/userfiles/files/90697796343.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092044908637---90948565931.pdfIn PDF document text
- http://www.annaleehuber.com/content_files/file/29222196171.pdfIn PDF document text
- https://aedwea.com/upload/foto/sazakofesozafezexivejiv.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fa2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA2F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011246.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11246	10564 bytes
SHA-256: `ca413a9fe5e811cdf701c97fd8729f30a82412b1893d269b4e6eb00d96c2da91`
`font_02_sfnt_off00012a98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A98	17004 bytes
SHA-256: `dec7300e7e56e9452907378eba2e6656d70cb34702b958af62fe6166bccbebc0`

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