Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f9ebfd2a1165f8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 00:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78a7d2fe4be3d6cb6ab6c3cae633d0f1 SHA-1: 3f881851a122713a12847df2e0f314e6ccdc604b SHA-256: 31f9ebfd2a1165f814d9ddce7a6f2783639c07346dc388db3c15e7fbbc535980
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a credential harvesting lure. It presents a deceptive interface, likely within the document body, to trick users into providing one-time codes or MFA approvals, consistent with techniques used to steal session tokens or abuse multi-factor authentication. The document also contains numerous links to external PDF files hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing campaign infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8420613c23ac388482617891490320ca/10944027761.pdf In PDF document text
    • http://spiregene.com/image/files/20210721_185010.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/26311789927.pdfIn PDF document text
    • https://memoservicesrl.it/file/giliwowizidewiguku.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/kidepunagifafavitawuridan.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/kabamojoxafinuv.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/i42eecv6fcip3tbhlj91fd2be7/89979187047.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/25436436062.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/sazolejizoj.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/noweravuxev.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab0111d3b---xusegotanijat.pdfIn PDF document text
    • http://teresachild.com/upload/files/30591852427.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/danifalusabu.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/88123574238.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/52671204865.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607196a1ed1c8---ximikiles.pdfIn PDF document text
    • http://traviet36.com/upload/files/31561859980.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38d8t0g4ugg2o2tfbotapc6267/71603610375.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/79631539057.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb73885d61---nitufimawusizarogutu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2aeaaff8face8f82468212fec4e4e887/43955454376.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/niwefokifunudov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+export+whatsapp+chat+as+pdfPDF 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 17908 bytes
SHA-256: fc678fef0c624d98b5e763883a9f6cee7b943f54fa8a6af83243b6420c82be11
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 10656 bytes
SHA-256: 0b5a31f0161919d6c790b93e1c9e84606cb57328ab6db746eacb498790042c51

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