Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bdf604cbe41b1b…

MALICIOUS

PDF

102.1 KB Created: 2021-08-09 06:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5721b18a7252414dd38b2e94848c457 SHA-1: a0657ba109ce46be345f047f767ef5d8ffd1c376 SHA-256: b6bdf604cbe41b1be497d2fed9e7b88ed7223945b5e6c5bc74188c1fcd9f4857
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised websites, likely serving as a lure to external malicious URLs. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=how+hard+is+the+six+sigma+black+belt+exam PDF link annotation
    • http://bachtungcompany.com/upload/files/lalolivawodozobatokoxa.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/pevizapemefevefu.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/32917272305.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/90026411617.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfecf8a867---37234603659.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/68755411760a26fa7736c9.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/leronalelisumumogimiwa.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119486f727---pabam.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e68b1bedec7acfd297abc324bd357702/86444534147.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9ab353999fb4b84d70f7e333cff0d3a3/xininesenawaxomokerer.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wedixikat.pdfIn PDF document text
    • https://securitydm.com/slicice/file/menofafafiponakanunij.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/16218814320.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c632c1b39c406012eb49b2f98dfab2f7/97574023134.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc2a814fa---18148062213.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6419bb68---jetojafogasanunofuxurov.pdfIn PDF document text
    • http://digifast.cz/userfiles/duvinasuximirigelepo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//74187846968.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/dixukutafamaxubezatubabaj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f01fe04ba6---69575070478.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/23944157357.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/manukevuko.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/tewuzoguvajonevakoj.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d958fadac7c4d4114018c618048e26c3/dituporidazumijazi.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_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 11124 bytes
SHA-256: 650e28ae3cdf85e38693d9674be4f2cc798165de503c0f5ee5828409e022b3e6
font_01_sfnt_off000142d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D6 17924 bytes
SHA-256: 59e7597de502b5821c2d5f4bc2221045eb3a043051609f7164e5ca675e746bde
font_02_sfnt_off000171b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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