Malicious PDF — malware analysis report

Static analysis result for SHA-256 217a14b5332708a2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 20:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7817ff6af582fec34d8f8e6925994c38 SHA-1: 4c9ec3caab53cbc48fd0408e12d9ce3b4734bfa7 SHA-256: 217a14b5332708a2f94da90782e7c39e814d90e0adc34f198d08f59175aed9ba
236 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, presenting a fake CAPTCHA or verification prompt to trick users. It also functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d324c21dcaa2d9d78a94df50d310c0cf/vasuwovezad.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/tilodudagerekumu.pdf
    • https://ccskin.com/geektic/files/tibejute.pdf
    • https://svetplus.com/userfiles/files/jogoxasawawaji.pdf
    • https://fcksa.com/ckfinder/userfiles/files/13510235025.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/98f95517ece1dea7bfe5d012940c2fd1/roxez.pdf
    • http://houtackers.nl/userfiles/file/53091341263.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f560c1401---81840511244.pdf
    • http://gazomotor.com/allinone/file/difolabukajiro.pdf
    • https://pristineleather.com/userfiles/file/lojawurad.pdf
    • https://marikakozmetika.hu/editor_up/15645082273.pdf
    • http://thewesternmist.com/userfiles/file/72549931988.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613326a0eb712---ginedazekam.pdf
    • https://debo-fit.be/userfiles/file///bepipudidunedofot.pdf
    • https://madspot.dk/ckfinder/userfiles/files/56760940402.pdf
    • http://chaitraglaze.com/uploads/84432930071.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23884040906.pdf
    • https://hiperaktivite.info/userfiles/files/41509098225.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/finogusedowopesepiwibu.pdf
    • http://kramor.bg/userfiles/file/nujuzumodavariz.pdf
    • https://kitapkapla.com/upload/ckfinder/files/rowefepodaxezuzi.pdf
    • https://sgcaregiver.org/contents/files/6108134376.pdf
    • https://blugarden.eu/file/wotifazoporab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+java+edition+free+code+2020
    • 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_off0000ed35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 16792 bytes
font_01_sfnt_off00010547.bin
f89ad551166156c68a4a435bfcf25993dee5958f72165565791cbf64f679af8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 18152 bytes
font_02_sfnt_off000133f4.bin
4af87fd710ec57fac4e45adac3bb232e37eccf9a32d4e8d6e5940f66e130a29a
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 10684 bytes