Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d1d57952d76fd0…

MALICIOUS

PDF

92.8 KB Created: 2021-09-08 06:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e158b6e94ac6331df141e83119eb620c SHA-1: 7badb560c79a5c61459e8245a7004e7e2d330a09 SHA-256: a5d1d57952d76fd0f0f37b34f2a84307e31958e74661dd7d4953c166983dd7c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it is part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic for callback phishing or tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=superboy+comics+pdf PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e6a95228986ee0e4da202557b304160d/30679699925.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/45fd91966fc834d2aaf991ee4d06a680/tagojamomuxenakegeza.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/68268804679.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lh6trdm51jpuunifb1ff2g99am/vanunofinerajakot.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/xipovogipi.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/fewobajipi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zamawime.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b4953b69a2ad707e8271b7f22a21c96a/1315809549.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/27815003557.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d6ef9958d91e60c22cf4de3ffb21b07b/77707951056.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a3dbfdc0b219526af424518b98853513/35448353118.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/sufulekirekekip.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/6480657963.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/58694802475.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612642159310e---kafoluzatavaroxi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fixaduredosijeduram.pdfIn PDF document text
    • http://mobitransjogja.com/files/renoroxonu.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/mupuzaxidivuzapewineduva.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/56753660192.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e672ac214f---45063703319.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/xuxadoxopesexetotono.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210713/16261258968047.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_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 17964 bytes
SHA-256: 86ce647cbec10aae56c4235955eccc025214bca3cf0d03e3c2b53177334d80a9
font_02_sfnt_off00014be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE9 10800 bytes
SHA-256: 04b001fd40233322310ca7efeaa1334c3c304f1c8ddae73c5f0e4edb3802dffb

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