Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e9e29e01beb001…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 11:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a7fefaf9247af5c4aa2e3eaad00dc9e SHA-1: e91bd2583fc4b6d04a3d746e8911b0b818d72b1f SHA-256: e7e9e29e01beb001780cefde264239eb8a523b867f36e14c3bea4629a76d741c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://erex.hu/upload/file/69091143323.pdf
    • http://skogsformedling.se/bilder_umeny/File/digupuf.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/94c9a25212a46be8e2eecd513cf7b38e/simapirixizujexoneni.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/05i9pis7esfev3kg1e9chdm3d5/rutoruwazeguvedabaxipul.pdf
    • http://www.aluvascientific.com/UserFiles/file/20355766542.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/xawifuluxafebow.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c574cbedc9---60860965038.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a15cc6e3827bf30e5394ae3ae524cfaa/67472990738.pdf
    • http://aryajob.com/user_upload/file/57694710328.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b971573f2---57150652700.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2p9qnn12r2e83i33qn0naj65lb/nepibixofuxekaso.pdf
    • https://beautyyaurient.com/editor_upload/file/74125148193.pdf
    • http://mcutech.net/upload/2021/06/file/1624627741795538192.pdf
    • http://vdadanang.vn/app/webroot/assets/files/duligefowirizo.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/50318794033.pdf
    • https://kueapem.com/contents//files/55535234668.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7314b6298---nutiximolu.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e8ae41d3d---jenepaminasusulumutome.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5rhhptcsrok5fe8gipprscj7r1/tedafagavedalipevoxewa.pdf
    • http://ballard1966.com/clients/22636/File/41364302303.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a01e77c75---15418653977.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160772399376d3---45806358646.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160799ebf87131---2834617120.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9181e309ca1b9c9cb8ea3d4aa7e799ff/9252179699.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sales+manager+interview+question+and+answers
    • 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_off000106fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
font_01_sfnt_off00011f13.bin
d3d0da4aebbd278ddee84cae2c62081baff6c7a72fac5b13606a916b7c19e902
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 11064 bytes
font_02_sfnt_off00013851.bin
ea84092dfffb282fd806a03a00fe321c7f5cf4ebf472a3750b66a09bcf6b668c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 17516 bytes