Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e4ed3288f3a013…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 04:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ff4babc165fef1f0d1d8b45d0c8aa6c SHA-1: cbe6685529ef69a48d4c3fa19f4772775f4bb81c SHA-256: 76e4ed3288f3a013b13fbef7f3dfc239ddfd7fd5867bd1f7fc13a70f429b9c54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of URLs like 'https://allytemp.ru/uplcv?utm_term=windows+7+sp1+update+manual+download' indicates a lure related to software updates. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=windows+7+sp1+update+manual+download PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1279fd638bf39b41ca864d29574f9362/16547036720.pdfIn PDF document text
    • https://coevent.ru/upload/files/58463158524.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e046825d---81385959499.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/60904530906.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/avl7313acr7272rmnlb3isa2rh/xikolikizipumaxolovu.pdfIn PDF document text
    • http://marymo.ru/uploads/files/mawunodu.pdfIn PDF document text
    • http://newmob.it/userfiles/files/65581667030.pdfIn PDF document text
    • http://www.heksan.com.pl/file/24880878682.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/bebekugafefisupalufa.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/avurcdvb35lod9886ran7usaoa/47125814538.pdfIn PDF document text
    • http://schokozentrale.de/idata/24833127519.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef3788dd2---34588260025.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/6961805205.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bdcfae484---84702967418.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/linuvonusetopuwevuvu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6f1164c218efdc72717f47566fec45c8/rurekosilo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58f62af29---rirakobesudozupekafupidev.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087587e5c5f5---pipazoxoxosewexo.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bce6822a622a8d62e7d426a8f2141c45/gasijuli.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/89440862298.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f89df1d4e08b8d671dc3c2193f639925/lirovosigomuxorudasulag.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.

FilenameKindSourceSize
font_00_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 10736 bytes
SHA-256: a097ef3ebae6be20429bc60ee5399ca62f4e3079a84d746cc5911681766ca489
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 17368 bytes
SHA-256: bb3592b6b2ec2d9d28e84fa42596c385c99deaa3bf9cb6f630c14d50b4edec11

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