Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b44cafcb61c6b0…

MALICIOUS

PDF

99.0 KB Created: 2021-09-06 20:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e8df3b2d78485672f75034d92a818c5 SHA-1: b592f41606d33ecab8aa94a11dda4025093783b7 SHA-256: 21b44cafcb61c6b0aad30ec3ff5c92781ffe95aaa6d116b0251a71646d7a4d09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6ab62414---73317467423.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/51014141504.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5d1a3c94---79298634543.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2dd8e02d077d15c372dcd83f97d962e1/gekonomojibuna.pdf
    • http://homeopathyhk.com/files/kededilol.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160995b875efb5---68401150928.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/906b942eb92bb296006c1d607e2773b8/panukifitokozawem.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f15317adaa---patazisagoloxakuzunemusif.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea9f49254260d0ba1aeccbb6af10beb3/zeroxovexani.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62134062---minagimerimerewalivove.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8e1f2c29---segivabija.pdf
    • https://mycocoa.org/images/upload/files/23568440413.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/doxapemiduvoponoladuzibo.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad9a055bac---30469925725.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f674674b44c04abb4f188879f73ddc59/15565591044.pdf
    • http://xingyeknitting.com/userfiles/files/kikiforemikujevenovaruxix.pdf
    • http://tkvolley.pl/upload/files/welinomabatakiz.pdf
    • https://pathakpharma.in/singhania/downloads/file/54273015407.pdf
    • http://uco-kampen.com/media/files/66838496730.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/zujotixasex.pdf
    • http://aeronautike.com/userfiles/file/dakumekakomozebunuru.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d2ff125033ed469839f64a0340cfa427/91084365366.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=trigonometry+worksheet+class+11
    • 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_off000116e0.bin
7df66023f85018d2cb189d5c7a32e43724e3b81fbeace9568116368f46db698d
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E0 20776 bytes
font_01_sfnt_off00014c82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C82 16792 bytes
font_02_sfnt_off00016499.bin
95f0e10e19a29dfa112d4ac65265cbdbc9494306c5b3f2d7f834b6e039baf821
pdf-font-stream PDF embedded font (sfnt) at offset 0x16499 10984 bytes