Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c178591632016fb…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 01:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b2c3880388438ece94623ffde73a43ac SHA-1: 704e872cffa99a95e41450340bde89a3115d002f SHA-256: 4c178591632016fbfafd98de95d1075f1dd885cd3ca1e8335277773c9c37527a
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 or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifying the link farm structure. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://humanitool.ru/userfiles/file/31227323374.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c959da7e---xobivutimapitaxekele.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5pfdeuqn2fjpqvjcdqd8dgdc30/52603837952.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160876e67b45a1---95031996185.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bafeeb4afe---59913745464.pdfIn PDF document text
    • http://bjjiffy.com/upload/jedolixefofo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/660uvtfv4nlrnteqkvrdhtut61/64918583367.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e35774eddace631d7a7efebcfe1ca59f/wevasokejenuzimujag.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1ebeb15d---37268602595.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/70737341739.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nbmj3b40h46dgef3seufv4lil7/xanavetuwebapa.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/38162507871.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/k99ib8kl0mgmb33sm39ikq6v3q/miwewesepiba.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/6t7eceefvmeagi15thos6eaqli/difejazisape.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096486edd2b1---95100408859.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/98739013384.pdfIn PDF document text
    • http://grupophi.es/uploads/files/pasizenab.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db6004e3ecb---86129557255.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0275c4b6---34664622411.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608834a54549d---90795618160.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/n08uuqhiqm2hj9gmlgpe77knts/miwakakuxanaki.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/letarivoronit.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ce37d58bc15---ximurew.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ebd6ed15---fadomevosefifuwebiwoz.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/napodezidu.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/tasefebivefojidome.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/zokuloxobutowenevesowib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=covalent+bonding+lab+answersPDF 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_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 10744 bytes
SHA-256: 2d2b86e269c25a072b8ffb122788c6688acdcc843174ce2707f82da82f22f2b2
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 17088 bytes
SHA-256: f15465e469788ad9271dab6d30a9c3698e2459b7549619f9175a06316b52f092
font_02_sfnt_off0001366a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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