Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad1faa30e409d6c…

MALICIOUS

PDF

78.1 KB Created: 2021-08-08 03:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a70dfc73f9f1af70e0a5580648e79959 SHA-1: 6e26cdaa76a1d3f5a4276ac44d52cda0fde96638 SHA-256: dad1faa30e409d6c9229d630914d07758a87a91f4d42b8040e0376ae72d03298
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/98d01c4c8b6d11718b625f15280fc49c/jowajesewimirisodup.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/mubuzuluwezeporuxusijipa.pdf
    • http://narcisse.sk/editor_uploads/files/womanadugeralos.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc224418e---mebogamefedunarivoj.pdf
    • http://frappsreagent.com/upload/files/xegumilagovujodup.pdf
    • http://aarogyamedico.com/userfiles/file/gajejewukuzobel.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ed8ed5bda6d10562235ded813c3280aa/nirukowovidi.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/66296356170.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080facb23ed1---mapudomo.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/bugukiresafabafejo.pdf
    • http://adria-ex.com/images/blog//file/naporabojuwiki.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92401b113---38792098055.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160740c00432b4---letifumi.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/822221e31aa6477ac70c467659ab377a/98511187541.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ff3aff4c4dd6ce92153ba980306a5328/70437594258.pdf
    • https://247hvac.ca/fabulous1/uploads/files/fometak.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a36414869a---83521799803.pdf
    • http://pagyesa.org/userfiles/file/20210717191836.pdf
    • https://fnb-concepts.com/images/uploads/files/92594780833.pdf
    • http://alltechsro.cz/files/simigopu.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/24435e9e022d9fcbd63679fff24f46dd/sojevasafo.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608280e950fb7---xokab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=conversor+kilometros+a+millas+nauticas
    • 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_off0000d089.bin
ffde889c73072d86152b22134bd37fe94233f97752ac12a7285f5d29a0eafcb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 16560 bytes
font_01_sfnt_off0000fa23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 16792 bytes
font_02_sfnt_off0001123a.bin
249bb1b574007aee1a9f2a726c57b46fde803f5b0dd377e6f2115ff7ed30132e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 10680 bytes