Malicious PDF — malware analysis report

Static analysis result for SHA-256 943cb689e32f92ae…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 12:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11960ebca074125c3a1588caf70f9097 SHA-1: 4566fd1a9e41b68ee30cc30a6d5e5e4641a0c170 SHA-256: 943cb689e32f92ae69cd7beed9dc932aba5307e77bc54e3cbff83a3311d1fa4d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=ahs+7+streaming PDF link annotation
    • http://kammed.com/userfiles/file/janabokoxoxepiwuvurakagog.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/44095660458.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/37115380994.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1526c13e17a93ced838e77288c0f980c/dinawogagufutanigonuzej.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/falotuxuwesaxagoxavix.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/76982357693.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/luguloz.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lumedidapivimovurofo.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210908175848.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mijegorutoxilejatixasa.pdfIn PDF document text
    • https://invision.buzyhub.com/files/2945426326.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/gajidikimojunobefopibepe.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/lazezivixatemivoxida.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ccebac974eca5134c337d6e426ce4c6b/79174741119.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nonarapasisajifubama.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd641cc30---79533511191.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/70511866107.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/24017124088.pdfIn PDF document text
    • http://reichspfarrer.sk/file/buxovimolulav.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091115473973499.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/ninezasizusewukovari.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/82026023504.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614430df19357---74328531141.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/51613326698.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/wogokunixe.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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 10420 bytes
SHA-256: df13cccd550461390696c083783e62314d00ca1c14d493db7d1bf9ef9aabcd44
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 17860 bytes
SHA-256: ec18980fa7ddd11cc2103b808d44327dd471c3f6420e3c22b50fb2763aa3df7b

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