Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0c893aadcc0a77…

MALICIOUS

PDF

76.8 KB Created: 2021-07-01 10:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab0f5ad06fe21f4c302fd85ebaf7b5ea SHA-1: d0f725263e8ddc968ca6ad4f8785e0946e1bc6fb SHA-256: 9d0c893aadcc0a778c4e4f7d8226954bd51e40880673f59e25a85369ff916103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting it is used to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to host external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0508f54d---zosogiwazi.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/69449852471.pdf
    • http://kibbkw.com/uploads/file/lemapadunovuwit.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/940684b37045af0e7f32d56f31b30086/ponekuviveditagedunegone.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b2a1d8d5f67fee4603c784f9e1442b62/10662696018.pdf
    • http://ascensionchina.com/userfiles/file/23843836340.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607efaf9e74e4---bimogeva.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a703024321b---70870947826.pdf
    • http://alimentosldm.com/userfiles/file/79790953379.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/r5eik9pcj93mlos0gt4mgib5m0/lujoraxopitexanom.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-6-22/20210622155724959486.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1aa8b0ef---kizuwuvukumutubigika.pdf
    • http://isgsrl.it/images/file/69964158844.pdf
    • http://project-lovcen.me/userfiles/file/22951528791.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e04658903---81644551470.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/bogadokovoxanivij.pdf
    • http://hollywoodterrace.org/clients/863344/File/26264362499.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607679e225d79---40395144142.pdf
    • https://cnn-logistics.com/asset/files/gafakefafaxik.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dqdl8srfddke0n36tu861fqkir/topemujegigikodiwuneruko.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8c0f6d478efaecefa8b0bb6f1094275d/6581457142.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b741521a3ab---18894151600.pdf
    • http://www.niziointerior.pl/upload/file/177149138.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/841dc91a323b3737fda9d41b807b0937/20098338622.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=remain+meaning+in+tagalog
    • 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_off0000c665.bin
25b4325b7b635580df805d25e9b261a5a26acd4024b42731e5d7c7458175231d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 10228 bytes
font_01_sfnt_off0000dd4e.bin
e701c9407240019f53527962fcf1e80983f1e025fa9877bc5a1039c794484c12
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 19492 bytes
font_02_sfnt_off00010e8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 16792 bytes