Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bd440bd72ee675…

MALICIOUS

PDF

86.7 KB Created: 2021-07-25 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4546ad06f040eb2e5de0f187e1eecef SHA-1: 6cc69de044107398fad3b0e1537888b849648604 SHA-256: 67bd440bd72ee67545a62eb7d7a749b89dce37e00377713c4f936a3e1bb475a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://vladjurnalist.ru/archive/file/42450389754.pdf
    • https://aprilboya.com/userfiles/file/mojopulisumap.pdf
    • http://agcslohian.com/userfiles/file/86767961064.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6df5fdac---36265008186.pdf
    • http://fujiya-la.com/uploads/files/jusotixoxitawamarizo.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefaaa9fb0---zeputenab.pdf
    • http://travelshops.pl/userfiles/file/viziwuno.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/83926266288.pdf
    • http://brandnewgoods.net/userfiles/file/47805770732.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607acadf635db---legoruximijepupagafarer.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/244cfe9e061e275ec98ed6c6e5e5ea68/dupibuk.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2176e7767---71840327804.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc44a72d2---65710626886.pdf
    • http://licausi.it/userfiles/files/pitis.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56b341bda---nuxisojiwiseko.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724eb0c7ca5---21876497117.pdf
    • http://nuovartea.eu/userfiles/files/95394838270.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a469d8bc7---97544674171.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083244a1e5a1---77370006090.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2a7a550545817641ee49d014c2737bfd/89805933126.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607f673b6097d---fikivavine.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rationalizing+the+denominator+with+conjugates+worksheet+pdf
    • 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_off0000eac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16792 bytes
font_01_sfnt_off000102d7.bin
001d95fe45c4c2507e6b5dd245aadecb076e5648c9a7feafbd58781a3107b53c
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 11580 bytes
font_02_sfnt_off00011e05.bin
bbbf19b03376da3c66e0ddaf7bef14fb8c34c2195e383310acdc1283df0992af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 17420 bytes