Malicious PDF — malware analysis report

Static analysis result for SHA-256 6221dc8708b9e2d4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 10:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 636412bd18e41cfb1eb8581bd8df9175 SHA-1: 4a97e51b9cabe9f5f86f4b345864fc1ecb267692 SHA-256: 6221dc8708b9e2d4c0819efff4f9a6b3f81e1da364d735484efdd2887a8c3162
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's a link farm and a callback phishing lure, suggesting the user is prompted to call a number in a deceptive context. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=how+to+do+a+voicemail+on+android PDF link annotation
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/joxopanojebisafenu.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/38283370877.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/60191653097.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/68980456261.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/48502696997.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/47709267031.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/52359419341.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/56395134027.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/86164092776.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/48d9397067b5af5df0c06e485cd4580f/gelulidafepaxixisoduwelu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/149d1de5d8c6dbc0b7fe2f9fbb8486ff/minebududewe.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd88a2870---98780976994.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/tiwawakeke.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/24219253190.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/27376877441.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/26670731390.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/69395704864.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kiralabizonijovibezerevi.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/bowatifegebubizexuwutatop.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/52807277166.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210913054705.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/vamidikoninovum.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/24583508031.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fekezebibe.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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 10508 bytes
SHA-256: 79fec238d0b2ac36a8a5b0bf8a7dcc76f79c7a70c994eaa3bb7d9e5ece7a2788
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 18688 bytes
SHA-256: 571f3fbadcb01fe49139995a525b71be7c24e1ccc9020aca17565f62abce2fe1
font_02_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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