Malicious PDF — malware analysis report

Static analysis result for SHA-256 f153ad3ec2a94835…

MALICIOUS

PDF

150.1 KB Created: 2021-07-14 08:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b73b1efebe0a3b6740cf2f78e53f612 SHA-1: 4f8cf2a6e3cce8a963c6a57e39404a5665291035 SHA-256: f153ad3ec2a948359139dc1cf4f02006c2b728aa4cc8437972506cc738447c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple websites, including those hosted on compromised CMS platforms. The presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 http://www.ecvbrass.ch/user/web/file/nemexowexab.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f725a3822---fuvujisagepapetuwomoxi.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97d30a3ec7b16ccdf915a97e5837947d/72394045076.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4510ceb663---lonodixomap.pdf
    • https://mosconi.net/userfiles/file/84856329917.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/gqqng7tqjncop4bv9n68i7otv6/72404842805.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ce8155f3---7713582797.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3604e133e---47849442510.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89979622935.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kbtagatk8lo9pvfbbma1v7oe7l/xodosunitesopolegegun.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d26f07af27c---58067530821.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ad33edd8ecf7e9d108cfd50cf297841b/miwejujuramasajeboturokub.pdf
    • http://beiwendq.com/userfiles/file/watepun.pdf
    • http://theonejsc.com/userfiles/file/22139044759.pdf
    • http://poexali.org/static/image/_u/system/files/21444538826.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f0cb0978697eb15403d475cfe1fe0b70/55173502789.pdf
    • https://rajatotogroup1.com/contents//files/gazamemisopawawutej.pdf
    • http://scmsalliance.com/clients/864514/File/nisekatawaxetedejus.pdf
    • https://tbsva.org/Upload/files/20210712194303.pdf
    • http://studiogiovannone.com/userfiles/files/pajuwixivopaforaroso.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/14583726475.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609501563be30---63713315391.pdf
    • http://ibb-online.ru/f/file/kobulidipugavudijivome.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=5+stages+of+language+acquisition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ead5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAD5 16792 bytes
font_01_sfnt_off000202e7.bin
0868fde55d3413ab93fc28a9a111510bf15e85d1b550fa5eed6bc10d2f34415d
pdf-font-stream PDF embedded font (sfnt) at offset 0x202E7 18456 bytes
font_02_sfnt_off00023268.bin
115952bef97a1004a6d5af39b8c7e72773ed7fe80d8f05378293c3f5fd00762e
pdf-font-stream PDF embedded font (sfnt) at offset 0x23268 10696 bytes