Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a81621e332f87b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 08:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1ab5fd64aa5809da03fec0269328a715 SHA-1: d6df1f18db6ae8d64eb16cdb29b0361a92389ee2 SHA-256: 61a81621e332f87b008d70665bb91a720995c323a5771b0e8dd8f14df786bead
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick users into calling a phone number for fraudulent purposes, likely related to fake billing or support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://biolabsrl.org/userfiles/files/60900705801.pdf In PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/nivagamujivad.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/tagexoporukupejomokewukep.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dakagasibufatixefajakom.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18c925622---senijilegirozizegumabuwe.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/dewag.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/25337257077.pdfIn PDF document text
    • http://djapm.com/userfiles/file/puwidojilijenezokovarovis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be313ba48---zagofiwiliwatafika.pdfIn PDF document text
    • http://didopack.com/files/25153259289.pdfIn PDF document text
    • http://dalaichau.com/files/25370023428.pdfIn PDF document text
    • http://tajilin.com/upload/files/pagulewofegesevavabutawe.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/tukubetaxufogebim.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/zezunixum.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/39550928794.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/wipatilogimiwubemorekim.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zesalotiremolopezuzused.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/79782015435.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/wisomewotot.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21e9c5013---63097007565.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/64149973383.pdfIn PDF document text
    • https://wildnaturetravel.com/File/28121650132.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/3652257398.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/33784776475.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143467f308ab---59192764500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+add+contact+to+favorites+on+androidPDF 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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 16432 bytes
SHA-256: e08d31280bcc2b5ce5b63f5642135d3eb5615739019140a54a1b4b510147b359
font_01_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10568 bytes
SHA-256: 11cddf38c634404d1b05b49ced6563ac3647210c4bb145577033d2b3000d74db
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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