Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb21d2e94fa5de4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 08:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4771be7cc1005b8f2d3b393f3f8b317d SHA-1: 796f3b2d438a9da59fc6f7833bf95007fceafb4d SHA-256: bcb21d2e94fa5de440e64b2ca2280e961f73305c4e87f571c9ec631e4cf05109
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aspirans.com/files/file/wilovogavupibaxabiniwozo.pdf In PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075857e8aafe---89963132461.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/153735224.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/7929849490.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609748c116783---56659152681.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/bilisafo.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/62329474078.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080655dd591e---81270715736.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a77236d2---30235457617.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/lopuwunokamivevaju.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/34266770568.pdfIn PDF document text
    • http://riversedgefm.com/files/file/gulemogop.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/26549983909.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/nojes.pdfIn PDF document text
    • http://belv.ru/userfiles/file/54860353497.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/gilofuruxixegexux.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/xowalokotifapajilinotusik.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fd4dadf8602cf0bfd951736e9a11937c/44086245809.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/21863220176.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607482a25b368---vaxodubawetiwo.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/32465408153.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d2be8d2e---44687258107.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/vobalukemepatogepepusofu.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/nifuduponivowararofel.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/gepit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=illinois+state+tree+and+flowerPDF 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://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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 18664 bytes
SHA-256: 91fc2e5d93528f9cf70bce4ebb4a0808f3fc49373e032ad3ef3aec83b0c9e032
font_01_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 10384 bytes
SHA-256: bd480f2e105fc4727ab975850a79406d9cc5ef71333fd87c0dd47930c6edf736