Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1a264bb22391f0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 20:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0621dedd0272b262c798dba56e58706 SHA-1: 1f1ea8064afd37f27632c049cbe88e18da1587ca SHA-256: 4f1a264bb22391f07f92d93eb9498251d13ee36cabbea8f05a62809069c8739b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, although the document body was too malformed to confirm this directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=dragon+city+apk+offline PDF link annotation
    • http://rialta.ie/userfiles/files/tabirol.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73623716142.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/93721173049.pdfIn PDF document text
    • http://findusafranchise.com/files/files/23141267441.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a048e10ae6---mixofatanekokegepijob.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/97992112073.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/visexewosabobo.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/dusejovi.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jimeke.pdfIn PDF document text
    • https://mklaassen.nl/images/file/72782657887.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sukunaloduwakutowif.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256bb28b9a---37040098186.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373085a4a96---8381439151.pdfIn PDF document text
    • http://bubb.cn/up_file/file/39324092414.pdfIn PDF document text
    • http://novafish.it/userfiles/files/taketele.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/dirosigol.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/waxudivagi.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/55017282025.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/bafibip.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/38499449465.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/konomisaxibufalapogu.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/57174092520.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/59413299665.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_off0000b854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 16096 bytes
SHA-256: a86e17e7edc2a5ef48dbcc473ddc8cf038625dd8a206d11836116bbc73330b1e
font_02_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10692 bytes
SHA-256: ed45cb2d88dc09b70a54e7c6e839cbe57a2dbcaadcd68ab65b1ed981d640ec97

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