Malicious PDF — malware analysis report

Static analysis result for SHA-256 517a80757ffa5f35…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 09:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50d419d3a0627f583fc087fe30c46489 SHA-1: 51345da6ecfc1026c7efded5247246490267fcae SHA-256: 517a80757ffa5f35eddad03488858015bc48389e0a5d64a281266cd3a4658300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=peggy+lego+worksheets PDF link annotation
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071929f65f7a---88999562248.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-6/20210606145543220308.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/56045333551.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16082029bc63fb---memaboxijupenolanoso.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jafakapovemukoxemukuj.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/gafetenupimomenejagiwawik.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c9da16a2---4427340738.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160adc73c1ee42---siwiganorexurelelovekaf.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/ffa6e8e39473e4dad69cb0b2e0e3ea26/87419113766.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/4b3kl5cbae1orl194g0n652ev3/vunopojugesinubebukagu.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/rowubenenu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/gogevodivagawumajefo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f3bc10675---bojadafojujitem.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdecae438c---vaxazelilevena.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fewerotadotawowotoxi.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/7841562525.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/486380265.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210624_537C1AC9FCF05DC9.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/90487360861.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/82432535339.pdfIn PDF document text
    • http://contelex.it/userfiles/files/rexeditinazudiwilosas.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5mdjnr9mfterjro6u0hjj8r320/15553692319.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2cccf34c---17160159406.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10324 bytes
SHA-256: a93f2fd777dfa9ed02eb55d5f3e55bbca8663d3bde51f9adb92991193a55ce16
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 18156 bytes
SHA-256: fbdf41a59c03c70aea958e417d5866725442f653bc40bf4e865d8cb163d32b10
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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