Malicious PDF — malware analysis report

Static analysis result for SHA-256 0538a4284d6a8186…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 08:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1509d31df8d53a87f48ae94d21c2f8a6 SHA-1: fe6606568683115fe225d8969f680e8378c93beb SHA-256: 0538a4284d6a8186442a2d64083787b9953319e2276fb8650e71128ea59abc7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2fn290hor3oa864g339hfu4di6/47548595381.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e3d2e9dd8---pukiwovuxazaparisizoxibex.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/wiposagikibabakuv.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/51881903242.pdfIn PDF document text
    • http://raczcsalad.hu/files/luvuwo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c49581490---17406799699.pdfIn PDF document text
    • http://kleiberit.ru/files/file/fikopagokabefa.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fjvcand625tinug7lf72tlivuo/58222739698.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843d5d5008a---66952422551.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/foduwilipijumunub.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f089fbc8---pazobolexojuruzife.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/60045401736.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9098914fc---fulawafadinalu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/11b3c98b047e21bfa63d69ae3f346a25/4537802666.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/45828826781.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/73272973914.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/to1faq99lnil4jo8dojsfjujh6/kideligejulura.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/weragefekomiw.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/12486062747.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/89569523486.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/gijewetedenu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f282727d51---9278376169.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/95916572815.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/75878159034.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5307c326936f4602a83a7e5268da6f57/16498630414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=javascript+get+only+digits+from+stringPDF link annotation
    • 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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 18056 bytes
SHA-256: 3475e0fb172e4d87e6bc3ae01acc14192ddaee03fad5568c1017c12d97129fc0
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 11136 bytes
SHA-256: 7a194dd4bedfa453cb5e6e6ca1af2ec5925917fbc1b78d7605fc8ad90c4c53fe