Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b4cae26de0442…

MALICIOUS

PDF

101.5 KB Created: 2021-07-15 23:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 372711440d07ebca07bf09c9af1ff3ed SHA-1: edda6c804b9011846ac57bc9daaea2d29605a987 SHA-256: ba8b4cae26de04420a78ea7eda44c9881b69f44be38650dda4e77c25d5a671e5
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains a large number of external URIs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detection further supports its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3016

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.
  • 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
  • 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.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2289bb6400---kedevib.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0321cd5dc0---59102505450.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/zodosufinumugegawixitetut.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/45263727757.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/40433786461.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/zokigesomidejuwisas.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ef1db78a---314178868.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e301d6ca366---12585427976.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ebc898e69---69497659683.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/65330669775.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/2915493217.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b73008c309c---49975691415.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/90933774979.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/96135185572.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/34843588092.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/xakunopuwigezu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a136572b7d7---zigevas.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b995bf24527---73663159703.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/a26d5a13250fe562edd6173e920280bc/66866715256.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/84738482092.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/95514575272.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zimaxegutajok.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0974ff95039c98b1348480294c06d458/39121118324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=draw+the+human+heart+and+label+its+partsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/44585676738.pdfIn 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
stream_002_off0000ffe5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFE5 22032 bytes
SHA-256: 84286d391cafc1d3ef79d40ffbb8445460fbc464049db43bacd6016247608bc4
font_01_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 10864 bytes
SHA-256: 414d0d177d28139c2b509f22b2e3670d87744f72a4d6e59a331c841ecab8b1a5
font_02_sfnt_off00013e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001564d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564D 3592 bytes
SHA-256: c92f99126a72e3ffcd4f99cca791e40a150e4cdbfa6ebb18ec5e7c5de3ff71d8

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