Malicious PDF — malware analysis report

Static analysis result for SHA-256 354972dde0ea313a…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 08:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4bedc9dc47f4de615472ed117bd3a0d SHA-1: f56e1d58e57acd0dc39844c8712777a73c1c74b3 SHA-256: 354972dde0ea313aaf5ae4a9f5b87d7f1cacd9e561e2e65b744e7b869a063d5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0d121d8c---95093678301.pdf In PDF document text
    • https://monographie.com/ckfinder/userfiles/files/60924984210.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/04b1ba3c7e8242085c857cc6ea4fb5b9/xegididivakajix.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/11835041872.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sibudazivomorefixefopa.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/puxatusonefotomajababadok.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca300724ef6---10909732328.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c56fcf3a47---visipevuparosibasijajajo.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/16958517866.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a466740b---kisom.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0054f01dbd---46803344650.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/77496174476.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2e8ff62c2cc82fdc43ff2de623bde682/genorunogukegirigoru.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210616_0A01A27E7B7581BF.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/77ef3843462a3183f60f0b43f758b68d/rijexomof.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vcguas4hhg6j9fb7qosn0o4l63/98137814103.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2d9051c73cb4a4921bdc01591a1f5b45/63064393197.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/rigulu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/errnk94mdu7nmftcv9js81daar/nenilemixavilujulusuv.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37760dfbf---67647947515.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f8583ba1549---88040137783.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/tijemox.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239f462f3e---narevik.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/08a3d0686af2de2c87efcd16f0c37af3/wesesaz.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/90757412104.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ffdc8218---narezasekumitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+wyze+cam+mounting+platePDF 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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 17020 bytes
SHA-256: 9f183a2ab822804ffde2a0485b37983349d269337e34b0b284cacc9f1979e7f3
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10968 bytes
SHA-256: 2d4a593527edbd98b589f587da15f9e1fab5786430293764c9477999d6d214e3

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