Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2723224c90d4ef…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 01:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1dd8abccf0c7013d88c2f62aaaa2dc2 SHA-1: c9bef5545d827acb9151fada41b51182553fd981 SHA-256: 6a2723224c90d4efd223f56d6bbd58c70bf3b9ebdc01edfc9e9ebbe0d87b03e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect the user to malicious content. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://faresaldabbous.com/uploads/file/9686148153.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/01dac02169528c0f5bb246eb4a888d4d/sebokuwivenolokusigago.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/fokosiridu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jfheqtk7mmb8qaoshl2kcsg043/zajinodapegipomero.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4e03d465---91069251350.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607964595988f---94660771907.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/zilinajigesigul.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/48325243546.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ikqlqhjvvnkevg608ef3vl80ev/kiremaxaxorovedudumoseze.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ac848bb3d---65878417293.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/iia5g32va25qqem97mu7i40uci/9909659508.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/wogokupowufuzorusilap.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c046069b46b5bf910f1b4bbb098d0895/donuxajujebopub.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a1bdd05d1---juxekepadakal.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/69370930229.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/kubufejamikufunexobukam.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/38c9dba18448945eb38d0376e22ddac4/96717861737.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839add133c4---60646331689.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/71505610267.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160db092345fdf---78776716778.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87e491aed---18448230973.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c5e5cc5e---fafawezaworedisidumoge.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7e56d08bc35af5089a16ff0c0094d235/40558574867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=exercicios+tempos+e+modos+verbais+com+gabarito+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f27960d507fb01696d2dec710f900232/tavijuxeligogujok.pdfIn PDF document text
    • 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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 20356 bytes
SHA-256: 3851dd9305ce39cc162383b050f26be0616364bd4b7d517ef12792fd2b6b6837
font_01_sfnt_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 11104 bytes
SHA-256: 090101c0d9446e927899f7ddfc8718b5a9da2245bace2a5cbc1b3bf834c06e56
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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