Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1814fbb2ce5e8a7…

MALICIOUS

PDF

146.4 KB Created: 2021-10-06 00:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6710968481da1fc8db550c0c7b48e60 SHA-1: ab00a66c7abca6181927201d08515c42fad6a38d SHA-256: e1814fbb2ce5e8a7cb658656ab6ce90ce79ab2a2447d87a30ecb209f6b277d11
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or redirecting users to malicious sites. Heuristics indicate these links are hosted on disposable or compromised domains, increasing the likelihood of malicious intent. ClamAV detection and ML classification further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://coretry.ru/uplcv?utm_term=wbpsc+clerkship+part+2+previous+year+question+paper+pdf
    • http://hidramaco.com/files/files/sanodapufoguw.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/84464cd5dbb71442f422423acd035ae8/loreguvatawefonebosoja.pdf
    • http://pass38.com/images/contentimages/files/bawodivebap.pdf
    • http://dierenwinkelindex.nl/images/uploads/tisapoxulizokugi.pdf
    • http://siblom.ru/files/upload/file/48061666855.pdf
    • http://boschvietnam.com/files/usersfiles/files/88650142877.pdf
    • http://fullx.net/files/68347127028.pdf
    • http://awfiowv.love-mrt.com/upload/files/dazupujotorovobuvumadir.pdf
    • http://arcstema.com/userfiles/files/90905414315.pdf
    • http://protok.pro/upload/files/kaviduzozilinimem.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/45887258368.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/kajasazaju.pdf
    • https://hattoco.vn/images/ckeditor/files/mofefezazaxinevu.pdf
    • http://yves-segers.be/userfiles/files/toguwe.pdf
    • http://www.cerel.eu/images/wyswig_images/file/zodikepatej.pdf
    • https://all-stage-meditation.tw/uploads/files/615325eef03fb.pdf
    • https://km2804.com/ckupload/files/gunaroxopojuwimeg.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/33041116113.pdf
    • https://meritumptt.pl/dokumenty/file/rerowixijute.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/44644664790.pdf
    • http://langeline.com/ckeditor/upload/files/452423246.pdf
    • http://eventechsite.com/files/files/9809661077.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s00k764mijmukcv67ijjcn7ar7/46938703958.pdf
    • http://prochem.vn/images/uploads/files/nivutajasus.pdf
    • http://homesunshinepharma.com/upload/files/basoramudilu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95e6eacb---sefemukidejitozum.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_off0001cebd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEBD 16792 bytes
font_01_sfnt_off0001e6d4.bin
9cdaf541cb18a850693e5e974fea74720aa89c4315ed6565a591d4541df5df8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6D4 11488 bytes
font_02_sfnt_off0002019c.bin
5480cbc08cacbaa26900a1a371bf0090cbb2c2ce52c4994f41b12df24a084137
pdf-font-stream PDF embedded font (sfnt) at offset 0x2019C 22416 bytes