Malicious PDF — malware analysis report

Static analysis result for SHA-256 221136d0c74a937a…

MALICIOUS

PDF

98.8 KB Created: 2021-08-02 21:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9345168a0bcdbfc684bdae115f9e7d18 SHA-1: 5a238a42f5c9f49576e7ff911181275bddc216ad SHA-256: 221136d0c74a937a4be7d85866fb6f2eef85e6ab4b254359caa4938ed78a1fea
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4339d3ab5cb1b50af43607b8bdf28044/17601657279.pdf In PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460b6dd634---6875294638.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/27273319749.pdfIn PDF document text
    • https://apizf.org/public/file/kanumalajegomadobuforiga.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fd9ee2b8758ed6b0511c2900e0032e50/93775747598.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ab77ab9cd2ee95ce8ee70b7b550a6299/kamumosimuranokakulebo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/govekasexumidinuno.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lawofitunusegeredumumu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/185b7f058690ccba361e648fb17fce1c/bululikesuxesizinid.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/depododigegivesole.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb622a18a---bukosunogiz.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f7db0c6b---44690322524.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/zobasixozoraj.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/r3ii07vkfncpljaqhatutimd1l/9643744831.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7f6c6a3290ab882eeb302f97cd9b4de7/ziwewuwofanaxafibigu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e48184e6c4ffb57c7540c7bce3cfcd23/54974616534.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210610072644.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097aec9f050f---354144177.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/birodonejawow.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210730_FB137A8F5CD85CF5.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/45404720980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=avatar+the+last+airbender+the+burning+earth+wiiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 18444 bytes
SHA-256: a1a8af2cf8b823aedd35cc8b989df9abb76f49814b77b861e1a76e18a6220a29
font_01_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 10780 bytes
SHA-256: 56d52a5567926117800781051d7d865cd273d21290a2d463f8bae3ba6d1ea038
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 21024 bytes
SHA-256: 3da5c3a4842faf5363cd197fca75d7b5a1c88d7b5f2cdbf0224120f0968a4bdd
font_03_sfnt_off0001646a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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