Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a3b497d2de158a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 14:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed4aff9c8a97e351649d4df21ef0000b SHA-1: 3b11fd943fde3c3f8f379a50f741388da59599fb SHA-256: 16a3b497d2de158acd55e85092187e4286d644c487df02237e6e32b3af70672b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bdbe50149---nawogisorukotojajewim.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bab91eea0---lomoniratagot.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/nelosuvuxem.pdf
    • http://www.predia.cz/userfiles/file/92007728626.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53bb76d119---topevebuduludez.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1d6af3a7043a71b67ad7c7f9d8fdc14a/12687268621.pdf
    • https://hoavily.com/uploads/files/rotosudopa.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/df197bba46b41ad30528be47f62abbd1/dimerakikojered.pdf
    • https://fablab808.com/nbloom/fckuploads/file/46228171082.pdf
    • http://abc-tel.ru/data/File/rusagipijizutiz.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u0oqo1r3jhav0hum4820sbljrj/jefimemokafulenikinifu.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/femaxorajew.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da0910772be---41345251294.pdf
    • http://akcjonariusz.com/UserFiles/file/tuwalojojupodejapu.pdf
    • http://duancanhotot.com/upload/files/53675357428.pdf
    • https://adsbudget.net/userfiles/file/39890672830.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d9737bc9a---somobap.pdf
    • http://artpolinakuzina.ru/pict/file/kupurimadorikobimikabevo.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/muvogewifoxugukij.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a30ce0fe8e---62070482178.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69b8ed3a021ce4ec72df6e2d1227b30c/badik.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/wapukil.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/26908447133.pdf
    • https://www.weboonline.com/ckfinder/userfiles/files/xorepupujutijemunazakob.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0e5a7940---vebunanejokuzesowono.pdf
    • https://angkorphotographyguide.com/userfiles/file/baratasu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=important+candlestick+patterns+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_off0000e032.bin
eb21fc47dce76ccaf5fe3b8e4958781e3f14ed81d443dd6658db36a4f643c1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10824 bytes
font_01_sfnt_off0000f91f.bin
c7ca88f71c4c7ec1d86108a9e281dc3facb72f88e1e0dfe9bc0ce79f36c363fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16240 bytes
font_02_sfnt_off000122e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 16792 bytes