Malicious PDF — malware analysis report

Static analysis result for SHA-256 41469d9c74d0cec6…

MALICIOUS

PDF

91.0 KB Created: 2021-08-11 15:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 161e74a65d48001c9a1b65257e92b193 SHA-1: 01e557aa6402b18a9520b127d33d9153c96f6af4 SHA-256: 41469d9c74d0cec64054ffb892905e2f57c708a480f2b618fca0046d79493e30
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608195244ad16---67155580030.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/98b43029b01df9c5a72647a0453f4557/3108222708.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/rozemoti.pdf
    • http://streathamtaxi.com/survey/userfiles/files/12702264512.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/chhikgq0gf88uvfq90mc92tq22/21167004449.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1edc3956b---82100462606.pdf
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/wotivutifotitokorelipa.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9753baec0---83276090267.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287ba4fa45---dujesibegowag.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/xunijazarajesujiso.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ef99be678---bunatorotewawusuwogamoso.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e158990bfc08740240582bbc0e968ff9/xofevamatolatez.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50c324b99---84183515772.pdf
    • http://lso-msm.fr/userfiles/file/tojijusasekivu.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8003b75e6---lugebuki.pdf
    • http://inwama4.vn/webroot/img/files/88935087073.pdf
    • https://damiel.eu/userfiles/file/68025493029.pdf
    • http://goldmustang.com/files/files/17370833922.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/84ec3e79284a54df681d479654b6cb1b/poragoser.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/cc9a8e6e44b5d8dc27558d9b3aee4499/xetufafitudu.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e893417bf---9171739433.pdf
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/rixupibuvafeteke.pdf
    • http://pileshoppen.dk/userfiles/file/96199671020.pdf
    • https://hogies.com/includes/template/uploads/file/46924886115.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=critical+action+gun+strike+ops+mod+apk+revdl
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010efc.bin
e44ea0108be4a0b35a240917c7deace95b431f6274f1e179da0d782c542db817
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10EFC 19628 bytes
font_00_sfnt_off0000dd0c.bin
413b2d08865ce8779897886e003b3fde38d0b619355d7c8380aa1afaeb748b97
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 11148 bytes
font_01_sfnt_off0000f6eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 16792 bytes
font_03_sfnt_off00012ff3.bin
18b587d5f964b9ad7eb68d813980ff84902daf081e33aaaaf4bb49182ae3eaf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 17084 bytes