Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7083f22f250f2a…

MALICIOUS

PDF

77.3 KB Created: 2021-08-16 04:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7dc022e04ace302c6f8f665d542ab3d1 SHA-1: e176267aa642d6c051c6aa6c9db7251e512e64db SHA-256: af7083f22f250f2aadb1268f290cadeb6e7d7f321115e5c6c323b46881f7028b
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://terminarz.online/kosmetyczka/krakow/files/22448928912.pdf In PDF document text
    • http://geoodwierty.pl/files/file/rexotesolizufefelurako.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/girebopujirofotawadeve.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26e826e014---dalozejozozuroxirenun.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ede496b816b---68772203360.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe09020f519---64512317298.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072acb665181---vefufigadogesejeb.pdfIn PDF document text
    • https://teamcode.net/upload/files/4574791600.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6897a867b---xoxusugago.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/945fba76096dde55a540deec3189ee6e/sakewomukefukewepawu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/382a4f8f3bd669e22895d3c82d52f1e6/nopavij.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b608ca4aabb---tedibededeja.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fb2957a9a---52320685181.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/75bde33f3bf744d1715725d580b2ddb5/12718999943.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/923afcb3972e2d8f6bc197a5338a537e/75822845769.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ad046d94916c3f179799736f9d98f9fe/27801894854.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/420678aef266c5bd837d02ead6690c17/janirazijorewenema.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/48225492489.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5fd9fc3060748301d21cb16b2fb09a4a/18787412223.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c26d3d9dd51fd8cae8f43ec10e5f3205/lojameregagimo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160762f386cbbf---7511128909.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9b4fb2360b96867c763f2a05d70cb1a2/88488489234.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/muxopovajodi.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/nitewadogiziniginuj.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/wanelejagadef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+qualities+of+a+news+anchorPDF 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_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 10760 bytes
SHA-256: be8394f88209b2858133bdba2cfafe14555e94ea5b99cb41ce3391fbaf711f54
font_01_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 16564 bytes
SHA-256: 19135feb35ab32042ce804d9ba5821513364b6f551d4b8c5d1b06ca82d9ffecb
font_02_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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