Malicious PDF — malware analysis report

Static analysis result for SHA-256 af343715744dd249…

MALICIOUS

PDF

123.7 KB Created: 2021-07-02 08:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3f3687e53814efdc18bf2bae8afbc2b SHA-1: aa261f1e2fcfa47965a2349fefcd0241b47b3b88 SHA-256: af343715744dd249ee920e8a14eaa6f5e945b2f5d624b36a4d40380a5f99715c
156 Risk Score

Malware Insights

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

The file is a PDF that functions as a link farm, containing numerous URLs pointing to websites that appear to be compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF's structure and the nature of the embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ea72880f6fa28bf3efadf37d39fd774e/xafikiduterabenedexete.pdf In PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/20130599149.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/22141339664.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffc54cfccb2a297a88fbacc37a891f13/93847027517.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bgmm4t8bp251o19a78eepj2mp9/zidijure.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc84ce63c---bowelugobepusuzet.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/86063562472.pdfIn PDF document text
    • http://mextro.de/upload/files/25026206188.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f8f772ba6---kejapunu.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/a843m3hps6dn1le1eg8upl1h2o/88497214379.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0cf9a95d89bde74be41f4123be1213f3/bisobutukezup.pdfIn PDF document text
    • http://land89.com/ckupload/files/fijero.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50ac22633a807e91785460508db6c5b3/6223643525.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d03372af82fe1db7cf58ea617402c21a/lexepodege.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea6f44f591---22866032638.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/penoba.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/j0dtrukjqbl03o963vtliq3fto/11570630646.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96dc417c41---gopalegifafuladolinagu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tqm107do1gpban4p0b3atguk26/23487327489.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/13839444672.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc23a136b---91537590008.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/m50g4rtk095ta8ujjredeuu2fu/zepeliwo.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/57890824460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+quadrilateral+with+four+equal+sides+and+four+right+anglesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000177d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D2 10944 bytes
SHA-256: af12100afcc913ce9dbcdfe4a0bd685c4f2cc2ec09579ad7fa437e9e19e0b39f
font_01_sfnt_off000190af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C1 20388 bytes
SHA-256: b8c7f923dc7ff20d705814da128ae7ed23a5ec1ffd5b82ee3f20f6223b0d32a8

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