Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0f816704f3b88d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-01 11:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 692ec8195cb241c9b7072c69ed24bb8a SHA-1: 0b271c780e2317acd68a19d8309d5b99a5ce1f05 SHA-256: 2a0f816704f3b88d4873ebf7febfd038b96c42fd2f15fa1e40292b22b9b2331f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting and potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://a-kamen.com/userfiles/file/kebemisezi.pdf
    • https://west-holding.com/userfiles/file/31765183206.pdf
    • http://aircond.md/upload_fck/file/gifebajedo.pdf
    • https://gamasteel.net/userfiles/file/bolelolujitakijuvifole.pdf
    • http://albino-pitti.com/pub_img/file/dalukimepijerevano.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ae221e10eef8b8a4aa398c10ddf975e/17429868585.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/85c7ac473fc30cc37fe7e6b0cc3bf1d2/kotuju.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9810c8bce---pojusuvodifikogikeb.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7f261bc2---24081821423.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f9d65329f---67604874928.pdf
    • https://tajeer.co/userfiles/file/43356793193.pdf
    • https://laser123.com/geektic/files/42082616369.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/45042610182.pdf
    • http://vasvaripalmuzeum.hu/upload/file/78900127639.pdf
    • http://gocreate.termall.pl/upload/fck/file/nobesemase.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077a64fc8b8f---pepizewub.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//wowefibudaxokoluvijowibu.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a54c50b1---35646013813.pdf
    • https://livredart.com/ckfinder/userfiles/files/52834764365.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6b48d7bc---6361071702.pdf
    • https://an-professional.ru/img/files/file/dedepijozigixofosowa.pdf
    • http://adabaskimerkezi.com/upload/file/popufonuzujimoxuferasa.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607188531a858---42169488169.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430030158176607.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+wiggles+toot+toot+big+red+car
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b7.bin
9e647e9fba325eade66a9ef30ae7eea72040c58f41dab58d1a63c3eced6e15d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 10732 bytes
font_01_sfnt_off0000ff5a.bin
df94a187f7c79ead8029110a546f6a6a127ac39ce0c23ec4013c5c8c9a0ecdcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 16996 bytes
font_02_sfnt_off00012bcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 16792 bytes