Malicious PDF — malware analysis report

Static analysis result for SHA-256 5545165e57085c69…

MALICIOUS

PDF

101.5 KB Created: 2021-07-14 04:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c15c0b36b86df09b62c72b551b9890c SHA-1: 7087c0d011f38d8d7f254df3f2335618100f2ed2 SHA-256: 5545165e57085c697b2737b36629cad272b00ff3bb63384050b9641920cb5dd1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608028f7c0410---90950438710.pdf In PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/xinomowuxino.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/35092633967.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/ronijujidexafarowar.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/katavugikupejemedetidivis.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd3a4ef39---sagekobifekolugoxaj.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b784b1fe43---40698606933.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/xidorejanefipifakinaxep.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/61232738569.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/86285978250.pdfIn PDF document text
    • http://debten.net/UserFiles/File/gizapinuzigogukaf.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3507fede28---89216471224.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e8328cf0f56002c00d4bef5c308de7b1/88218864212.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/05e5830d2812f54423743ed78baa23c8/24016746543.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/fupuzoxunulumepomolu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/ziwuwu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875f91cc19c---xisozatu.pdfIn PDF document text
    • http://debden.org/userfiles/file/tetigamijofudukude.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sikfpvesikqk8ctopb136n6g3f/75079388721.pdfIn PDF document text
    • http://krzeptowski.pl/file/7107054168.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/japowunew.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a642c641.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32933325521.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/mifevirawipisewamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=talking+about+moviesPDF 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_off0001279c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 10712 bytes
SHA-256: 1b67a12f5476661417daec15344bee1fe6ae2e1106f4b7c6649e3eb8ef55791f
font_01_sfnt_off00014048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14048 17892 bytes
SHA-256: 822f6c760ac63d3f70b8b44eff893404db66eba66d6aa55dbcc97ee0a135e488
font_02_sfnt_off00016f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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