Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb959ab7fc464f3…

MALICIOUS

PDF

108.3 KB Created: 2021-09-21 03:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eecc1019d5c774b6e609b18b82b40732 SHA-1: 75be9949514467deb534fe2dd3cc7be40275e035 SHA-256: cfb959ab7fc464f326d791ef0dc19e99a6d5793485160698ed56c3cd24088cef
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of an advance-fee scam. It contains embedded JavaScript, which is often used to obfuscate malicious content or redirect users to external sites. The document's structure and heuristics suggest it is part of a link farm hosted on compromised WordPress sites, likely serving as a lure for fraudulent schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147183fbfac5---3375364473.pdf
    • http://tubemakingmachine.com/uploadfile/files/4279326736.pdf
    • https://konteshamamotu.com/userfiles/file/wiwidizejatumo.pdf
    • https://dgssu.com/upfolder/e/files/20210904025440.pdf
    • http://apart1day.ru/file/43133473339.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/85658b298749dab89982172dc46557ee/23577552929.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/04/jalonikosezaropugatewebis.pdf
    • https://arichaindia.com/userfiles/file/reputavidokegimusapaxa.pdf
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/samopokolikejudelum.pdf
    • http://forti.in/userfiles/file/67347864419.pdf
    • https://giaiphapthietke.vn/media/file/files/56061741867.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/67243418398.pdf
    • https://onderdurdu.com/upload/ckfinder/files/87453154472.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nisalugogu.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6990d92---46261859163.pdf
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/xuzipadezalesenojutokoxap.pdf
    • https://mamap.in/ci/userfiles/files/lipitejogekakivujutemi.pdf
    • http://sprinter-lab.ru/content/File/zudebulavoka.pdf
    • http://worldprint.su/userfiles/file/9750618437.pdf
    • http://daechienglishpark.com/ckfinder/userfiles/files/fokozusesejimokuligo.pdf
    • http://sarkanyhajo.hu/files/file/44481006378.pdf
    • https://gmnavarra.es/ckeditor/files/94586921115.pdf
    • https://tinhhoaxanh.vn/userfiles/file/livudadudonapasoxenuzuz.pdf
    • http://shop-cartuning.com/userfiles/file/kevuxekuweruvebafisiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=twilight+saga+part+1+full+movie
    • 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_off0001401f.bin
3f5030186a4eec14204c1b8833cbd30a312edf702cba0be0e84e99311c5f805d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1401F 10968 bytes
font_01_sfnt_off000159bb.bin
ef286cb29c1cc07d6faffc7914da5df67490d2255d4f4fbb25cc0e2a3e15697c
pdf-font-stream PDF embedded font (sfnt) at offset 0x159BB 18828 bytes
font_02_sfnt_off00018b84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B84 16792 bytes