Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f70d5079df2499b…

MALICIOUS

PDF

67.0 KB Created: 2021-06-19 03:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b10f8a6c9bac2cbf75714fc9cc3e77d2 SHA-1: 62a36fc0b0e57fc91982bb90e44ac96f26fc9260 SHA-256: 6f70d5079df2499b33a28ef43e8b3032e9eee2c5b10917578aff1bc30f6fbc04
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to WordPress sites utilizing form plugins for file uploads, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ot2or5pm22k6j4d9nfup4jajbn/jixivodux.pdf In PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/606584e11cbda4fe7449ee21724f81c1/wuzola.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e46865651c---39519684502.pdfIn PDF document text
    • https://mattress-leader.com/media/lugifovir.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f574b861---87528269950.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/fewupazubalowemazuxaduded.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/fanapujokanefa.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/84747505898.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160743b33a80f9---benop.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0bb3748bb5---49647949737.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/23672964857.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4342db8dd1b18e2a91318c90d5a94263/muvonabomexefenejakize.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0bfa57c5612b4d80dc63925fde7abe54/vupim.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/texinaki.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tibunigizugukeg.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd41a8e0c1---tavajebinurug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adhir+man+zale+ringtonePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 5100 bytes
SHA-256: 35c5ac0050fb6f24d16b1924294d3a69eb8d18c42b63cbc99b1e27d144b10ebd
font_01_sfnt_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 10716 bytes
SHA-256: b2d2a0735645b71f9727356af136dfbde0c004b73d33a6551f331c51374aa6fb
font_02_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 4136 bytes
SHA-256: fcfbf9db1e56323b384b5982d2221db5430697e612f8eeb00c1758dc99a46b98