Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0a71c4493ac717…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 10:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 286a8529d8517723c7131f9b910be508 SHA-1: 0f81bb797c71d5ec8f7fb9fa375a2fb075012979 SHA-256: ad0a71c4493ac717a8da5d6fed0b05427f002480fbb651afbf7f788aee111653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external websites, many hosted on disposable domains or compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=x96+max+plus+2+firmware+update PDF link annotation
    • https://derya.afmiletisimajansi.info/resimler/files/71709201229.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kinepameguxasokuko.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/94240992660.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/56892303236.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/86673176993.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202198112243254.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613503f6a2bd7---29411730168.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109042106265084.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/jiwizugavafezalesur.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136789981d4e---56059087135.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/88239161625.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/94502074686.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108312254356328.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/38126759065.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/52594861655.pdfIn PDF document text
    • http://chpcentre.com/files/file/sulinozefuxijijigizimawu.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/14060194656.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/59208148300.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/5710795451.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/47521708172.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321a4ad391e---lunarebasabe.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 11188 bytes
SHA-256: 8ef60c958265354dcbcfb5f3072affb15e295eb389f6f4a5a9a584eb6ad34493
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 18532 bytes
SHA-256: 55570122e736babe352b9714c2fe44e302ab2bede4fe13578d63c1e6a4cc976e
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1