Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd730a4041d9f1a2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 22:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ab10417a7ab5501ba6c3d7958133b2b SHA-1: a64ec8a6f0a130155f1e98ae170f8515fc3be005 SHA-256: dd730a4041d9f1a2d2e550f2b980f8aca709623c4833d5a1f91b03d7f1744ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=alita+battle+angel+putlocker PDF link annotation
    • http://jjw-led.com/userfiles/file/benetabalepabemogumajuw.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/ratiguvugipozon.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dizaw.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/79839557958.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/66936769077.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/moxexafanidikosurodewitu.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/81905899796.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/53667121857.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4db773282c540f9977adf67418c78d70/64620350667.pdfIn PDF document text
    • https://felicityokolo.com/file/gutoba.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/govibanalopoponulevilugiw.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109131955104317.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613051a398874---dabarerusa.pdfIn PDF document text
    • http://meta-min.com/files/rujasi.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/jejewagubel.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/dusidudesusawojimelez.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/54206567122.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/bevubeweletofun.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/18590716785.pdfIn PDF document text
    • http://elitvorota.ru/f/file/88458936526.pdfIn PDF document text
    • http://holzweiss.at/73687477025.pdfIn PDF document text
    • http://electric-kernbichler.at/91355037189.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3eputtba4mht73oui2n74e1tg5/49697318067.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/68010831860.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/fujegixi.pdfIn PDF document text
    • 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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 10692 bytes
SHA-256: d1c76569aabe0732b950b67d7dd2e6d3ae4e8f3e98a80ff8987bf357f8614e29
font_02_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 18672 bytes
SHA-256: 4713925b1d4a6005077396785ccf78db714bf281542c071eccb20a2b4fad9206