Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f6426175c793be…

MALICIOUS

PDF

84.9 KB Created: 2021-07-18 19:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2020828d9169aaa3b1a6c4b124e997e9 SHA-1: 87184430d978648ebecf733553d949da27cc30be SHA-256: f5f6426175c793beb9ab62850cb03b1de74af23ce9fb3c976024bcabcab23583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/80d5an2e917kqbhpu6sfpl1nlu/57615755908.pdf In PDF document text
    • https://paymentor.nl/uploads//file/16340670361.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1be6ab3eeb5d103081f9b53286129616/xegotutovagosebafi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af06a56b6---22780390082.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/lolotirufivatemoxoma.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/nolanalejelinulapas.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/gidijoj.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815986a26db---46693519010.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b179441d---47661816150.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8293b9d322---vozirexitukekomutem.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/40944365055.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dacgpuqc55o0i6berlf0r5vcro/75596937046.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3f6ef108926926e988d1de90207faef4/bureguwomudupex.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/543255552a728d911d4307c87f23d9f1/rukinezelewogobokavagozo.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/nekitafi.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/33566361309.pdfIn PDF document text
    • https://isleo.com/i_photos/file/gitevopojerageziv.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ac8a95f0a8d96ded0a4f0e316a05562d/41482559475.pdfIn PDF document text
    • https://mszukam.pl/dat//file/14154696928.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/38677060589.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/6e33d5956cbc6f15e32444f41056d2c2/vebumunu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/4838302293.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/tofenuzimuxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=eating+less+than+700+calories+a+dayPDF 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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 10916 bytes
SHA-256: 992667505a36a53ac52c70d8ac4cd636c263ac4e6c6ab95e635fb533dc0efa55
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 17132 bytes
SHA-256: 6b114acea5d7b6a7722df424276bb1e62c56e45dccae42a6590891a40be2879f
font_02_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1