Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3c975fde4c3662…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 10:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 920312d9629253bfe0d6368f2a16641e SHA-1: 77d178aac8b9c9e5d6e2ee5d6960cc6ca29564e5 SHA-256: de3c975fde4c3662f2704307ecaa720ea5c22ba9eca75d8c8245bc02f8c00025
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only interface with a clickable action, designed to direct users to external URLs. The presence of numerous links, many pointing to compromised CMS uploads and disposable hosting, suggests a campaign to distribute malicious content or conduct phishing. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=teatv+mod+apk PDF link annotation
    • https://avistravel.activsport.ro/userfiles/file/41761174341.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/3706989474.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/47e681abe5a3402f879bafd0a16fb5af/bamiwaxo.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jesubifenadituper.pdfIn PDF document text
    • https://1ar.sa/userfiles/file/59284329516.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/31231045016.pdfIn PDF document text
    • https://kokomanis.com/contents/files/dosamalogipisunamepuluj.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dk370qm0sq8ik24tnj2c7t9rm8/mipexirazezurofe.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/76889720847.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/jaseg.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/dowifitowa.pdfIn PDF document text
    • http://rvhifi.cz/files/file/sujawawubemirepaselefu.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/ralapa.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sodalosona.pdfIn PDF document text
    • http://e-sheremet.com/img/65995859284.pdfIn PDF document text
    • http://halanmilk.com/upload/files/dobefutaporozoxijudabaf.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614839623d9e5---rikijatarad.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/wepixidoxiz.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/wapazufazenafukowezaki.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/14706451842.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa237afe3d---viwube.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6843717c---bitagafed.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/77436583446.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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 10164 bytes
SHA-256: 2e4ec177cc814bf0c0574cc3436d32d0e145f6cd7ff2e80b523eb76ebf776a36
font_01_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 14156 bytes
SHA-256: f1656a36043cae4877c4424ea917c7b820928ed82f240d3c716fd4671126c8e0

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