Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6a760701bddd99…

MALICIOUS

PDF

112.1 KB Created: 2021-06-26 12:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dc7db5af9c5be183ee48a71fb2f602b0 SHA-1: edc35e6c7e43b91d6fb887d20ea317f18363cbc4 SHA-256: fb6a760701bddd99e1649c0cd3ad885708b165ee10335df8950e05bc8f576aac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986335dfbcf---vitutudenapokavakerudip.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9e087f13---26606754314.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xikaganisuxeviwufezob.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ddc5787035a913a31b488248f0b577bb/binexuzomuj.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf527ba55c---nedibatuluxof.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ab47d7d6---sabunamibufuweromanu.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/57285575098.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b14532e8648---sulolebumisu.pdfIn PDF document text
    • http://learningkey.org/userfiles/sasukugixulekudupepotu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd57937a9---29837782304.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a1b6dddfefea04e18dd6b73c6a1cb081/jewurovu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/80385651692.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c1c3d33da---rusidudub.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/675939ec3e6292a82c078cd687747fc6/35781714876.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qhbp6uvvtqp5ghanrlp2mi5u1v/laforagutusulezirofo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818794bde9e---xomobazuvazogibogudi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nkgbd9jnl7hpj3qukj70gq7cj2/dogume.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a009556b63b---31152250722.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/paturawuwemaxexijuraputu.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/92221545510.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4279119118---kodoxukujimusolebodorovut.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd614f836---66153102230.pdfIn PDF document text
    • https://datawire.gr/files/files/takonoxulejakokum.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/93f1fdfc97be86e70b6710adafb48b77/vixevawukeronupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fraction+bar+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 10476 bytes
SHA-256: 8576d1c98db26e64efb902e6d5abda2c53b56ba8e271e73ce057ed05cb1575c5
font_01_sfnt_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 28920 bytes
SHA-256: 74d74b2de7d76a45863282528df82353734b80a744768c6e056224f65555422b
font_02_sfnt_off00015e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4F 23236 bytes
SHA-256: d0c17bf518ba64e613cbb0ea7f990c4242a8b85626250398c10a5c35e6201eb9
font_03_sfnt_off000188dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188DD 4676 bytes
SHA-256: 7016c87a4d7d2f1fd1b8a26010a87c1dbbbf2aa9b76f1a94bb9ab9709698f844
font_04_sfnt_off00019a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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