Malicious PDF — malware analysis report

Static analysis result for SHA-256 7167e39cf1981c34…

MALICIOUS

PDF

72.4 KB Created: 2021-10-02 14:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8755f564b5be242886117bcefcea42e SHA-1: d7324b5f7a21575388fbdfa08a7727661eb970d9 SHA-256: 7167e39cf1981c344b6735f092a50d23dbc0a4ec3257455a58e10fa6350e302a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, indicated by multiple heuristic firings related to random and compromised URLs. The presence of numerous links, many pointing to potentially malicious or compromised domains, strongly suggests an attempt to redirect the user to malicious content or a phishing site. No scripts were extracted, but the overall structure and URL distribution point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=the+most+common+type+of+manual+handling+incident+is+a PDF link annotation
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/12694990033.pdfIn PDF document text
    • http://mcutech.net/files/guzubir.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/83559580772.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/ninoladogosujodote.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34514948931.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/11a7cb90e987d25f8d415cc24c53e9bd/37428152475.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/9638850411.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/31349291148.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b952d0dc4---34179739464.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/kiforokipedosujipugob.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c480109248---72044443724.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/25522112852.pdfIn PDF document text
    • http://aven.su/userfiles/file/gifaketumewufarebomole.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/59184542948.pdfIn PDF document text
    • http://koutingchina.com/upload/files/54093861393.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/66191392638.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0j57gnd9qr1ui0vvdf13guispk/56461642304.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/vekubowejowetigopu.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/vutuzem.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/linuwab.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/90214736960.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/38504573911.pdfIn PDF document text
    • https://kor.mycultureis.com/FileData/ckfinder/files/20210927_74C4031BFA8EF3F9.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/tubedifovimetivut.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/rosogox.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/41065549240.pdfIn PDF document text
    • http://boxethai38.com/upload/file/63638493989.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_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 16732 bytes
SHA-256: 44ffc4f86f27fdcd015e2f4567def5546dc4d1e61a4e2376ad7f8e4abf691f7c
font_01_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 11144 bytes
SHA-256: 4a5ca32383be13b5d71b335b8dcd9f2bdef52b960cdaa5f14ea3d470c227f8c9
font_02_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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