Malicious PDF — malware analysis report

Static analysis result for SHA-256 099adf570a290973…

MALICIOUS

PDF

89.0 KB Created: 2021-07-14 00:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02f5fa79503dae7baccec64169dcc670 SHA-1: e8084462db8e0ab09306bd5a80d1ed3ad4a49eff SHA-256: 099adf570a2909733c4d4ee959917a7d71a7644b18486b02393a588cee21da40
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised web hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to disposable hosting and compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbb3e137b---60009305396.pdf In PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/botozijo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/951621cab045394860c0365194fd5a45/xejorodu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/tebafimikawaxarabuxa.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/1579257113.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/7022694542.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/sovuvupuxa.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jevajikomorujaboxani.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/58430296742.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a523d1d94a---79425960660.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/86245106340.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075966c38a40---68956460847.pdfIn PDF document text
    • http://aurora-c.jp/files/files/30640616468.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dd97f36e6---69621660315.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/m51kj8rrnvdvglj957hkkhaku4/58555472067.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/54590183033.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3765645136---18975249313.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///55815200189.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/72697254702.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/gisuledafifobunemef.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/118e333715f507585e992e4a195094d7/fokepegepivalibu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bawawi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xuwibebixisefidugugi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9ed2f37bf50a210c8a8e1fffe30999bf/gojedolututetevomerofozel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ants+with+wings+in+housePDF 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_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 10244 bytes
SHA-256: 235764da7e142b71cf817937712fab377609aa9b98da433bfdcc06fc3071a36d
font_01_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 17584 bytes
SHA-256: 0af7e8da6448f79132232736541a391e634d22b6baafb32ac57edc672f6ad247
font_02_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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