Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e0def0d91d67a2…

MALICIOUS

PDF

68.1 KB Created: 2021-09-23 01:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9564a1c348e2aea8b279542fa726be94 SHA-1: e26c62d0d2ba88c1755e6245dfeb8faf6e0705c3 SHA-256: e8e0def0d91d67a2c1e1238348f95cf4fc945e93c2b56736b8b6e90edc58be02
216 Risk Score

Malware Insights

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

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to trick users into clicking a link. The document links to multiple URLs, including one hosted on a compromised WordPress site and another on a domain with algorithmically generated URLs, suggesting an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/09d0b84579dca239800b1a3108f25e36/nowulu.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/xadonimugumepuboparirelip.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/rodivibisusizuzefodajel.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/43804616985.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/salisunubebewezivu.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/rikisujemaderenakudubef.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109151111466340.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/53476275985.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/terexevewamujezuxidoboxar.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/fesetixisolo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b97a09c8bf---81703266499.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/41997008085.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/dazixa.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/tibuletixeduwidi.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/tefaxurobo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3fae6de6---48523549101.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210904231227.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/babufunebewofazakonadi.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/15262202108.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/901130230.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614177cd9a81a---42764540655.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/17244189643.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78a6bf2be---41535498616.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kiruxupi.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vinub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nba+2021+mobile+apkPDF 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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 14316 bytes
SHA-256: 1b0b1c73cce813006597cbe6d79f41e4028be956e4459adf3783a0af7ea2ea8c
font_01_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 10444 bytes
SHA-256: bb91c9bd79cdaaa5c61a1ceb0ddffca2435d76e4c2a968071b73d658e70561b0
font_02_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1