Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01f0be51a5b3c3a…

MALICIOUS

PDF

91.6 KB Created: 2021-09-11 23:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7261b3b981b2b0bceca7826b134a7546 SHA-1: 06266535b33854e81013d6e46578bf214ca53c59 SHA-256: b01f0be51a5b3c3a2bbaf8ee0aa4b3a8866e2bb1abbe51a315eed89f72f0214a
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 identified as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs lead to compromised CMS upload directories or are hosted on disposable domains, suggesting an intent to lure users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/74648375418.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ee5fcb4e246e04023b756f4fd62940f0/zizekuvopipiv.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/xigipugoderogu.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/15361913910.pdfIn PDF document text
    • http://capri.lt/userfiles/files/94071602443.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631103958.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/45391922241.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/zapawogusijigubamevizesaj.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d8f91288---82625820159.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/24249156455.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/93371259307.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b77b2daa4---62764191062.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/96094919209.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/jesijakevozutirogojemog.pdfIn PDF document text
    • http://beta-rc.com/upload/files/mopigamawotozogaxamibire.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613405c6426da---85018752349.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/79047094120.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/78543015756.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/kabas.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/45611440209.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/gowufejavutuputizivavagow.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jolemitesuzetejozikex.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/78928715969.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/6257254001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lost+patrol+rules+pdfPDF 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_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 17508 bytes
SHA-256: 46035ac9c87233b725389836057e7e652975ef2f487e0eabf45571142da36fa2
font_01_sfnt_off000130d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E9 10352 bytes
SHA-256: 494851c93868863a617b0f390b16013d1b1606471097c05ea25e23d9e010ada7