Malicious PDF — malware analysis report

Static analysis result for SHA-256 d424f74d90cdcf6e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 08:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc8a062650b7eedf4fe9cfc17450fe8a SHA-1: 736bd84309c15257a3d5474cc4f0ad8725cafcec SHA-256: d424f74d90cdcf6eb357b57cc2b00f853698f3a16311fe52551df57b6b7b8042
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites that serve further PDF files. The presence of multiple external URIs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt, likely designed to trick users into downloading more malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=significado+de+autodidacta+pdf PDF link annotation
    • https://marcuspietrek.de/MARCUS/files/file/61955114278.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b635ed3dac5---81782410878.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zadutiluzetuwazazuxejakab.pdfIn PDF document text
    • http://kasargod.net/uploads/file/30027871149.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/womazigatuzadidaxuge.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/53101418619.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a37662421723cd24371bf15aee8a9ead/pumisunuwoladof.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/gujifu.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210830021015.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/40747110480.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/bilubudenosusigedo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e8c7b2c48005b6db75cce7bf56a3dad/nugofez.pdfIn PDF document text
    • https://computerzone.pk/file/77320891091.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfa954de3---rosesofogipinex.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/61672190378.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/95356054905.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/2905818347.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/4034493759.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f354d31a4---xejavumavifubeguvoj.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/60108905261.pdfIn PDF document text
    • https://costarica4d.com/contents/files/18886671050.pdfIn PDF document text
    • http://vejwun.cz/images/44261590008.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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 22012 bytes
SHA-256: 0189a10622fb04eeb6dc549036c25fd98193884b76c78adea2e3bebed71a164a
font_02_sfnt_off0001370c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370C 10656 bytes
SHA-256: 441bfafb33b98e1ef4b1c94102a9d9cbabdbe57dbc757e72d977490a97b3c44a

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