Malicious PDF — malware analysis report

Static analysis result for SHA-256 79681fc69735eb80…

MALICIOUS

PDF

82.7 KB Created: 2021-08-21 21:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8374f2e24902cab3ba987f0e40a7be62 SHA-1: 46c3dcc8c9b1064d4c20d57ac43c2b4106efd0b3 SHA-256: 79681fc69735eb805093af346b711cc6dd39a4171517852e46c5db55a4a2486c
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or SEO poisoning attempt. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' indicates a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the links and the detection suggest it may exploit PDF vulnerabilities or redirect to malicious JavaScript.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=anaconda+3+full+movie+in+tamil+free+download PDF link annotation
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wedibubovegam.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f9bebad9d2da07a8eb01fab5dfb4a871/davudosugep.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/46323359988.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42460195785.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/8965188161.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/47883717545.pdfIn PDF document text
    • https://windsbs.biz/files/file/22908335267.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/79877301544.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/50381255452.pdfIn PDF document text
    • https://eternalbliss.net/file/logujapej.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/i2b97vnt8ep4cdlmbst9etdeh2/85577749147.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/28682308700.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/wawojonewin.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xezofenojimonorawasutameb.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/sogisapexosedudorulami.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/guxolegudosumev.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/20732852130.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/57344114025.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0c62f2c93---ligevadurerudupakab.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/56bc1a3b313d52a737c83323570025e5/komekaranavip.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7d7086158---10626076353.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a9dd5a452---86707406711.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cee137297ae---savefodobinixukisaje.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/21935548880.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/59953481428.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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 17480 bytes
SHA-256: b0a578ab1a629e85a6733057037c3247c0ca08e67f0fdcff29eeeee6ffb6baa0
font_01_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 10872 bytes
SHA-256: bfc10141bd70f9d73f80051db2668d9030a5e169b25862e5d60fe004c3bd6e18