Malicious PDF — malware analysis report

Static analysis result for SHA-256 195f0f737030ccb8…

MALICIOUS

PDF

95.0 KB Created: 2021-06-30 06:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3e0da822ef19dfd865f7359f5734d441 SHA-1: add5d300b3b373b8a7b4b43bc28ca01363019418 SHA-256: 195f0f737030ccb8ad59869386230c44109a4b20945b35f4b813cd31e95c0d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://synerhu.ru/uplcv?utm_term=give+an+example+of+a+disaccharide PDF link annotation
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/16ae03f1d1d82849c737c5a4d6d70bf1/sikoxa.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5c927cc90a85ba92a680093f9296b555/seralaluxu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/84f4f00f165a8f461fb36ead310594bc/60792834952.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/gutarizezetusojoma.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8a18eca20f981679230c74ecd62d745/54750636264.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/ponokirimup.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4e372e30---wudodupovomutizozelime.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dea82ae7---34985685518.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/tulufaz.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cad878e1---xulajem.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6a5onjh9f5i462tjknjk9sat60/82109011296.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e61352a0---27124461463.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbce48dd2b---taziki.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/tajofadigudalupevorud.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160746de69b913---zoxowegemaza.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/o0anjdagv2umr3ubkngf1kh8ac/xozejakifivope.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070a460f2383---14328610930.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af8b08098---sesojelalesuli.pdfIn PDF document text
    • http://chikatere.com/Upload/files/12396056566.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/57285995116.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc9056e3a4---89514938987.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/juvazufulirozedo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/61276775185.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da101a2f9d---59017301760.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072001f25f30---xaxukegazapenefesunul.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3d21470d---zusixejunesajigorifa.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_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 10992 bytes
SHA-256: 47fd68969f29aa9aca47afa211a23b776ef5a6de5d71885e45b124e7b03d0d2e
font_01_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 17536 bytes
SHA-256: 569aab50c18703d163a60b32da731c0594ebde78a22c5020a1112f63ce8fac21
font_02_sfnt_off0001566a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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