Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d668e1741e88b5b…

MALICIOUS

PDF

85.5 KB Created: 2021-07-26 10:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3be882f2bb3db943e75b6915a75e5cf6 SHA-1: cb00b1153f42cc3808b50a7dc8446084e3b1caa6 SHA-256: 1d668e1741e88b5ba547de8e3686b7dad6a2f14a3b4ada37831f5c0edf51f47f
156 Risk Score

Malware Insights

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

The sample 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 compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f186fe520eb6c599e0701dee96dfca22/punerafud.pdf
    • https://digireg.ru/upload/92789483353.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f8826b836cc45e43c4a44e1cd2aa464/jafume.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/25036638120.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/nadafiwukuwakudetimisetag.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/32d8c49bb5c351d3d1532276deea88ef/34510072488.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/96112727302.pdf
    • https://ceccargiurgiu.ro/userfiles/file/75987689532.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/makumawebizoxujexi.pdf
    • http://prime42.ru/userfiles/files/nipavuranuzi.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085f46cddffa---91023335917.pdf
    • https://patoman.ro/ckfinder/userfiles/files/vojuwiko.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/jepikomupavexejekuv.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a127452562e---44844900299.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8eb743aeb384619228184969024828ec/85188382596.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/6ad63f32feba95dc9e34349617ec623f/lebixav.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2f0b85ed7ae3a9acb4ad7907af5dfe6d/vovidifizut.pdf
    • http://tecnoservizi.com/userfiles/files/60076559956.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/52d064289bdb160c5bbbe12cf2cb044f/pupavedejoguti.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2c3f6fe22ffb60dab57822f3be49f111/lagelu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/726b97cjgu5mr5detnqm2iujg6/pilit.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5974ceb6d---zerosuwurisi.pdf
    • https://imagebeaute.fr/userfiles/file/16355501922.pdf
    • https://rozgarnetwork.com/ckfinder/userfiles/files/84991213485.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bahubali+2+hindi+movie+300mb
    • 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_off0000eb16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 16792 bytes
font_01_sfnt_off00010328.bin
d981a75de8bc55c24270151dc28b1aa992c00e396fbd622805963609bfd42651
pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 17332 bytes
font_02_sfnt_off00012f71.bin
abc75f6aff0cfde57b6193f9376022a93bdfe6bb4f2db7a7fb861e7554e5aa7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 10920 bytes