Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedc13f4219628c8…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 21:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbfb0dbcdc775d8b16ab924b83e3d70d SHA-1: 37c710a4ff72a8cd5d68ea08cef6e08ebd9a5b36 SHA-256: cedc13f4219628c87a6f2b74b50adb76122d0e30db38a80ad1d496a53ca71489
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://netinflux.net/userfiles/file/wajujibosesifotedazoz.pdf
    • http://schs1968.com/clients/861610/File/wusep.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/91064045704.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094131d8f66d---44611553541.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f018264d55---pebotepajutis.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba777d8cf93---51416071955.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073706aef305---zuxofa.pdf
    • http://aquatherm-graz.at/files/71697320554.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1acef96029---jimevegurununolebik.pdf
    • http://apsons.eu/files/file/mixorowixegizoparedowiz.pdf
    • https://behagi.eus/files/galeria/files/29796779334.pdf
    • https://shopabrang.com/images/files/xebugakozolumipet.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/im2c7dcrs8qiq4tn4qdcotgdsf/jazazenal.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0u6fup9u4770kco1t7s00a4r91/9890144136.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aec10a04d88---79286152703.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba91ed208---xaninisevamum.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf110aa16---34424152064.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t6diu55dv4iqsdsqp0i415qfl2/77134285399.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced3b119cf---13344101475.pdf
    • http://dunajecbiala.pl/upload/File/wusekivo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d659482edba---21755485801.pdf
    • http://adamslakeband.org/userfiles/file/82708635740.pdf
    • http://ahchala.com/img/file/rivagaxuxud.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ae0c69d93e00d729385833323584177f/70674568864.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nonlinear+systems+khalil+3rd+edition+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_off0000df63.bin
7394bfa77046eb66b02cb158aafaa0ae27813a8bef0b503e03692751c31ad33c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 18364 bytes
font_01_sfnt_off00011017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 16792 bytes
font_02_sfnt_off0001282e.bin
b2fe6faa499f52f28d66923b522dad5d4bb37d2eb729bec0876994e46298d5dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 11120 bytes