Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c30fb3d8754612…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 03:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4142beec6490ce675bc46128850b3b8b SHA-1: a39f5e55a65927edf0950ca92d857812dce328b8 SHA-256: 82c30fb3d8754612f809ca17807d615642367baf6fa6d70da0ca8bd896fa4c7e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted from this sample, but the presence of external links and the lure pattern strongly suggest an intent to deceive the user into initiating contact for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=does+alexa+work+with+ihome PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098629c8685f---kilajagodu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160784a318d3dc---80035867456.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bdhvor51vt5meh3k8v31eimg4s/losibat.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/54515108817.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ulotdeopnbfq2jm4ea71fak6f3/lumevilasunukodunofomiko.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/95050831625.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3898a02055e984fce0c7dbe358a4c696/10855261944.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/19061613339.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/76979449497.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1b53ff5f---32246790693.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/89809987193.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/22131084344.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/jovebakawax.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/72801611625.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/7356584083.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/juwex.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/subirabevebepu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/58698471802.pdfIn PDF document text
    • https://austarpharma.com/upload/files/wegugegewalap.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/saruwada.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c8b20f19c9bb0b9639aa8c2a26ff0b1b/tujekolajarerizoraxar.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/23415490359.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_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 17284 bytes
SHA-256: 78fa15ef2765aa949dcfeed3a8a0da4db45bba20a0a1ef7858a82859d2c5213c
font_01_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 10552 bytes
SHA-256: 27c9487939af967486f5f6d5f366c8e07ece1f85bad285921daf115f720d1ce0
font_02_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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