Malicious PDF — malware analysis report

Static analysis result for SHA-256 549ed99054ebeecf…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 16:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2944952fe0f9a8b922472add66b09cac SHA-1: ecedbd6f521b118a5b17fbdb7f8d599f44c0893c SHA-256: 549ed99054ebeecff29dc4aff88b60bd3119dbcac452451557365681a3e0260e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common phishing tactic to disguise clickable links. Numerous URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a spearphishing attachment to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 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://queure.ru/uplcv?utm_term=root+phone+with+adb
    • https://lifesmart.ro/ckfinder/userfiles/files/nudoxowak.pdf
    • https://btsis.com/upload/ckfinder/files/37573363879.pdf
    • https://pmrmhss.com/userfiles/file/36962541859.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568e0da9ce---simililaranojolazamuzod.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/94136663317.pdf
    • https://agt.twwebmarket.com/ckfinder/userfiles/files/83330700162.pdf
    • http://av-jet.ru/userfiles/file/17234653733.pdf
    • https://cicimanis.com/contents/files/60451534741.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d03e6921---94570915936.pdf
    • http://fluitec.fr/ressource/site-image/files/10877531509.pdf
    • http://allineers.morefriendship.com/upload/files/10535468175.pdf
    • https://corianderedmonton.com/ckfinder/userfiles/files/22703511295.pdf
    • http://dga.gr/ILC/img/file/28719215780.pdf
    • https://rotterdampools.com/contents/files/xibagozetobinefogovuf.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/58219555446.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/majavorakopexagakolekik.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/66866055129.pdf
    • http://ps-chiptuning.hu/userfiles/files/supazenozufeloranovo.pdf
    • http://taiwan-tsai.com/upload/files/97648724665.pdf
    • https://cplastik.net/data/cms/file/lixikanekita.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca51fc7b19---66670431296.pdf
    • https://advance-pack.com/editor_upload/file/30280699519.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16146ef80920de---sujugulomawaxe.pdf
    • https://securitydm.rs/slicice/file/xedafaji.pdf
    • https://gea99.com/ckfinder/userfiles/files/19109509375.pdf
    • https://myvideoclasses.com/ci/userfiles/files/65517652847.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b074.bin
ca34fa65fe108d7629f49fde7e0c7a6eb8962ed74b3cb204d486042c160c18c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 14632 bytes
font_01_sfnt_off0000d4dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 16792 bytes
font_02_sfnt_off0000ecf4.bin
e0a55901a33f30a80951490c7098b69f3899d161ce3e6bd7f6542b57e4719067
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10448 bytes