Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aba2e7d72648f97…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 16:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 37dad2c676ceab0407dc9d91df13377e SHA-1: 1abdc262e2705175a4184b7da905b1b9cccbfa2b SHA-256: 0aba2e7d72648f972c4d732dad88ff2dc26a14a75bffe3db2755b4fad037599b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://iltorg.ru/upload/file/mizewizebikilopirakumow.pdf In PDF document text
    • http://hamzalegalservices.com/userfiles/file/sonimozilanoxuze.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/11530947401.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/puvuzojofuledevulumej.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/wuzepawuxul.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/wewiwun.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b8af4e529b4048abf3aa2d0cf92e6ce5/53573177872.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109252122124901.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/46546238520.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9149d7778---67136033826.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/39805311317.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/58552858272.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/72069235858.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/17515712699.pdfIn PDF document text
    • http://regmac.net/userfiles/files/wanufefu.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/68374629400.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bumagimugolati.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/44868592459.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139993d7db12---bevaw.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemevareri.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb11802088---fegazikiluwipu.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/12181495449.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/18354984834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+am+not+able+to+make+calls+from+my+phonePDF 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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 17432 bytes
SHA-256: 4a68b99f5e707e8f5d5fcd0894da568e2cb1312383adc4ff7ac002ad5fdd897a
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 10948 bytes
SHA-256: f6c4a1f9b0ac41ae5041a8726086b52693964c59945532591c1149d640214a95