Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba18896a973d99b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-20 10:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0840f0301efdabec06549f481deb62ee SHA-1: 75315ad7a34dee404a0442643e6afc796ad92da3 SHA-256: 5ba18896a973d99ba4002c4c2c4af10175fab4a8d464bb33aceab6c5d81b2fd3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. The document body, though heavily obfuscated, contains embedded URLs consistent with phishing lures, and the SE_CALLBACK_LURE heuristic suggests a pretext for users to call a malicious phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7193b01---nafevujagofilaneber.pdf In PDF document text
    • http://mcutech.net/upload/2021/09/file/16321176671876394368.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0f78de39---47702074857.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/guvimubanilufi.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/medotapiwekitoravuwalu.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/vinik.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/7200677851.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/60420112470.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfbf8c3ba---39033372673.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/binowameruvuvanomupiru.pdfIn PDF document text
    • http://kite-surf.sk/files/44942120535.pdfIn PDF document text
    • http://c-six.it/userfiles/files/77326147756.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/t4k1ol39824dbkmkkoia5vv3bo/72208553122.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/vakaju.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/20850088008.pdfIn PDF document text
    • http://teplospectr.ru/images/files/31214865171.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906051619514.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/73u2nr31nulub7cllem5jo20tm/sekulowazetis.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pupun.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-17-06-25-16-51.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/puzifizefatavupesabisixud.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/64535371164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=high+heels+game+iosPDF 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_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 14996 bytes
SHA-256: 43bef9d6036a7bc6cd49a257671df6e1b2554d3363b6e56601cf7ee8140cce1b
font_01_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10244 bytes
SHA-256: 596f8612cd1494bb7b6500bee4287ec3a3b26fa084c24fb2693751ab891ebaa6

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