Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a817aada05092e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 21:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7075f81bbffc0f2f3f7f25abe1fb9fe SHA-1: 62d822675c3879d28ab88cd74640c0e9c9f5cfce SHA-256: f7a817aada05092e64012672ca1be605261d106d85c3ba83b2e511fe0692ae0c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 http://architectureanddesign.it/userfiles/files/wewirunigen.pdf In PDF document text
    • http://isleford.com/filespath/files/20210907021834.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/98233566646.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/jusajinirovipov.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2de72c27---85236087217.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/wagul.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/64823064046.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/jidasidawi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/wavimobabuwenefilebokel.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/rininiwisipubozenezozu.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/pojopalekofagewi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/36006267987.pdfIn PDF document text
    • https://andana.us/files/files/25133577532.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/nopuxiv.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8pd2ke3ecfe707pmptnmontej1/76494622533.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/54769843616.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/g152kflk03q1a4mckbivtin4o7/vuzedopuludorisizujo.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/73280963911.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/litosawe.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/96151726722.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewepajosixafovasesiloro.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/tuvijewevewuwireworuwa.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/20259331385.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/67094293485.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1lbheq1u1iffbh36qvu532hrq4/96807427692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+types+of+rainfallPDF 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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10532 bytes
SHA-256: 3561a2781294aeaf6be300293d898b83646f2391786f0823801247d1bf5d5bb5
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 17288 bytes
SHA-256: 631c1228b86a48ed9994038a81f5f60d6660b92006e6c78821e58781d54e35f8
font_02_sfnt_off00012ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1