Malicious PDF — malware analysis report

Static analysis result for SHA-256 41928831da4089f6…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 05:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ce1192d8f3ab528f45d52f1d192a07a0 SHA-1: 3047e86bcd15e9f12d883382a4ebde7dc9082c8b SHA-256: 41928831da4089f63b0434e11826c17aa8b6ca7bd1e44251a7e8667a06eef8cc
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely using JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ea024acdfa38aef4a02b55ded6e28ea5/80228198224.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093714276552---vasifibavatu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/10v329muck2vufs8mfcsg02qd7/ximotumilurezub.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb374ecb61f---tifagazedegiwiregozonixif.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e238a70944c4d9be852e2fa769880f24/wosotorutepikumukijen.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee939c443d---dobumawojom.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pagewegeru.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e37d0d64---10469333078.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/28070790402.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/de64036a7595d1a8cd33f2ce6ac6ecca/dimuxubonoso.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e037819aa2---desijududemiwamobu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mabr5u1htq72upi52j7gu5gr1d/87262420220.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/efc8bb8cd98ef6368b056d286df5de85/85752866952.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/baffc366881572a6f16c24ed01b94c6b/jabapitit.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/trvsm4h6ouqsj5deom7p01vdln/15022102433.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/12132620879.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ebc07a299e680b7c6e231323a42ebcc/diwibetokesozapolikeso.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b02b5e01674---bojasepijuxijar.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af70c3e9569---luzenuwefebiza.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47116973491.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nexezajizuwozisetora.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca17fc4562a---42773972373.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608438ac9ca16---gusikuruwogagefodevavafi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbdf2adeeb---5606983470.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4b263495a---45875888043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rohit+lodha+geography+notesPDF 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_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 10828 bytes
SHA-256: f8c12d182baf2049edf32157bf9d13fb4a325dae3f18147e2d6222a4e4453e61
font_02_sfnt_off00013cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF8 17196 bytes
SHA-256: 9068f508cb9f47954d7805e9b311566ca1f6f10634272b16453a8db2aa09d8f0

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