Malicious PDF — malware analysis report

Static analysis result for SHA-256 4074f5b51c98fce7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 08:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41d7d810b44002f24200b461a5d71577 SHA-1: 10b890836aae25f571754c6d547c3f89da41b9dc SHA-256: 4074f5b51c98fce76478c5eced93c36b781ae6ba7c35812b97a6401570b3e2b7
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a high number of links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xdata.pl/app/webroot/img/ckf/files/85373412859.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ihf5i97ik13gat9tgn1at06g2/pexoxegenagalutupula.pdf
    • https://kaptenhoki.info/contents/files/58459128842.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496bc30afe---guzujesajetolativiw.pdf
    • http://ebiocell.com/uploadfile/file///2021080200412717.pdf
    • https://argumentua.com/i/file/99650035208.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/12827219983.pdf
    • https://komunalno-vrgorac.hr/files/difomogerukotorata.pdf
    • http://degrossier.nl/uploads/file/79426717425.pdf
    • http://residenceraffaellotorino.com/userfiles/files/40268382231.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f6d8e75291f967315f955207124111ea/88444647249.pdf
    • http://pushgroup.lv/userfiles/files/zapevemufi.pdf
    • http://parentini.it/userfiles/files/92077335373.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-7-21/20210721185742978786.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/81odeb5f51clf7d5rc110kabn6/27234498.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/66953336494.pdf
    • http://apple888.vn/luutru/files/javixaju.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085b1e1a9d3---66137520722.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/95668837654.pdf
    • http://studiogaleazzo.eu/userfiles/files/xalamaditisapaxaketofi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/703c11a1f85503568eb0068e2f973a1d/loxorog.pdf
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdf
    • http://e-cluny.cz/UserFiles/file/tizawazifexufufepaxexo.pdf
    • http://niszczeniewaw.pl/userfiles/file/55995936121.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ideation+workshop+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_off0000e31d.bin
95bf744a00c7b2a3eba4040f6450dd39bcae00e4db722e7c17e5fa50f04fc201
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 17548 bytes
font_01_sfnt_off00010fbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 16792 bytes
font_02_sfnt_off000127d6.bin
330597d529450293bee049de513a0cbe5820146840dfefd1b88c69c6f9d6abd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 10676 bytes