Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d4820ab04dd41c…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 08:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c753a374b6e517bfbe0693767ffa776b SHA-1: 0952c84d00b78d28b72f4eabd31d60b56a38c515 SHA-256: a7d4820ab04dd41c9a4bc21b76c334ec48d049060913cb02e983cf9f8040f277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chinatriage.com/ckfinder/userfiles/files/54784002432.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/lefasofo.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kegepadepa.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jitezunevebesudedodi.pdfIn PDF document text
    • http://waypl.pl/upload/File/45769413857.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/63276017883.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde1acb758---boraruvutawutulozevada.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/35514833396.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161585b76c47be---11670710061.pdfIn PDF document text
    • https://anjingliar.com/contents/files/69121113325.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/80233429084.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/xunawawusopogumoji.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/bugozetaxezumobabemoxi.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109060030138893.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b66e6555c1---pateleromogufato.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/rofejo.pdfIn PDF document text
    • http://csp.hu/editor_up/ladakadijaxivejiri.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/48823317417.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/kekubusurexujajemaxowub.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b488b3b7f---xupibuguwiref.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/90377997927.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/dibigewixa.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/96224474864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=her+eyes+are+watching+godPDF 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_off0000b08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08E 14676 bytes
SHA-256: 29b3fc0981aed1953d71884e71982cf7a4a10e0201d43a11a9a28838bda48f45
font_01_sfnt_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 10792 bytes
SHA-256: 7a4669c20bd15c866529715976380acb4bf14eda848d174964cf5b0a8317e3fe