Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac4a8dd3f09cb0d…

MALICIOUS

PDF

84.4 KB Created: 2021-07-06 21:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: addcfe683e8e66dbd2411445b46b9031 SHA-1: 9d4f484a2bba2d587a4b71467209f98268fbb1af SHA-256: 4ac4a8dd3f09cb0d042a509278faba1cf04636fecdd5e82e855e9948c43d2b09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6130a59d192b1346928eb706d2999b63/doket.pdf In PDF document text
    • https://art-lamps-rali.eu/files/file/fekorosizelevipa.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/75708999be5a93f2c21f2554d81940be/kugimakigamoj.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608447288d1d6---magarelodiluniboporovejiw.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gufeworowere.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ac2dae721eea6f4e451ddb54d9192e3b/tasixurolafota.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/nigomumojijebapuxez.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708cc8a08c5---fitesevojilipejinomijeku.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e82baedb---25293423278.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e85e624c---dudene.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/paduzagebodaparopamegip.pdfIn PDF document text
    • http://01host.ru/userfiles/files/tikozubap.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/fuzuvutapajaku.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/72189045965.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cabf8cf9a89452a3c1a98f0c6923e89c/45034197398.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/siwedakun.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/54421509794.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a44455c95ef6c048509da94b93d0e161/virixejo.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/zezimalubexu.pdfIn PDF document text
    • https://sinarwaja.com/account/files/19955353370.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a85807ac7d41b761490eee86cf6c8926/503290068.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fk9svh63uhpfr3c194t05bcgba/9880547595.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0412980b28e3133345db2188f1932629/juwekidikefufavizevumo.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/35608084116.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/906901917f9af738d4903267fc3f6aeb/27159670666.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/sewovufutumas.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/37411353860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=zac+efron+just+wanna+be+with+you+lyricsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 3940 bytes
SHA-256: 258d7ce707e6349c475891980762f9bbb3471c4accb48d2924e737afa75273d9
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 18188 bytes
SHA-256: dd74ccaea1176dfb63988365dbcd49f260c6212b913c7473615d8dcab8513865
font_03_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 10968 bytes
SHA-256: b324579915295491101fce957494f02fc2f39dcd83144404c85cbeba40e96e86

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