Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91578a3f0f8bca2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47d8c2ee4b3fdfe43a341f2e4dad91a4 SHA-1: d80edbd30ec81f6f78add30af2ca889c81886b12 SHA-256: b91578a3f0f8bca27ba01530111498b8e1ecc4a08976e6084bdc382a40bffdea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=download+roblox+studio+for+android PDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bad08ce83---69614554750.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/fogaginomuvaxexifego.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/sadibevudiv.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/59685448581.pdfIn PDF document text
    • https://jotelek.hu/files/file/giwukinelidijitidejidi.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/tevapiv.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/ropiruwexerevakupasadavax.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/fuwonexofenupiti.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/51fa17266ee43e29925bda619338eeb5/14670669228.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0687d27c4---9482399584.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e2ba4d75---52270365815.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xuforonigomudiru.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/52785960301.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gga1v0h75eho6ceupj2661iv7s/98909821193.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/renuxidixere.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/pusenexa.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mevonopiwibida.pdfIn PDF document text
    • http://thegioioto.store/upload/files/minajonomuluv.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/lutukilafelo.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/tipakusukosu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45818b8de---xufanesavivagifomunu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407145377.pdfIn PDF document text
    • https://petek.biz/resimler/files/20175773908.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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16996 bytes
SHA-256: 082db70235ed7ff10a8c89bcbcf56872e9471b41e69f0b85dfcf90d3357507fd
font_01_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 10644 bytes
SHA-256: 73230c4ee4811d1ed0e2b5d4956db132d256857ed0bb2190e26e1435be836d6d
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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