Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfe7f262657b7e0…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 05:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3e293762dee7cc6cc066989d1c00ee5 SHA-1: a4e83441e2a3bb23189adf80cf15e4017543c32d SHA-256: 9bfe7f262657b7e01185fd529d7fd4bc91430204c0394a7c8a2a8d3e55160407
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links pointing to potentially compromised websites. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated, preventing analysis of specific content, but the overall structure and URL patterns suggest a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 1 text block(s), carries a click-outward action, and is only 69 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 http://rtm-plus.com/ckfinder/userfiles/files/tijojewaru.pdf In PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/sofefuxefamitejerifam.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fbc490a1c350fb01adb3fb81d12be4bf/32413722798.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354054fac4---9460691298.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/93529049548.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/bodolikimutapo.pdfIn PDF document text
    • http://sissonne.hu/editor_up/lavudixujabasix.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631867088.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/1196443354.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/makamesimivaziwubodumesox.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/mikedipoxobobixoxomuga.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/94696192343.pdfIn PDF document text
    • https://vitanov.rs/files/jawusotomewema.pdfIn PDF document text
    • https://adfaveo.com/image/files/20210924_211633.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/4511646378.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161312c860eb65---gujufelakewunivimalif.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/pasex.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/57600633671.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/gesavisoxumiwonokavoxu.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/kokatakokanewajejadupeton.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0626aa668---demefotok.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140849d0a6e8---jipegafupomamawifuvumofa.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/vivadaxevozukupenuxegow.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/82750752392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+youcam+makeup+for+androidPDF 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_off0000b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 10908 bytes
SHA-256: 99f6d6879ca57836a5910c9c48514c3357f42025195deb506f9e23ff7bc6bae6
font_01_sfnt_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 14176 bytes
SHA-256: 840d637b0f11c1f67504f9ee4aecebfc0f3a6a2af9e3a21be84c33634f07a273
font_02_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1