Malicious PDF — malware analysis report

Static analysis result for SHA-256 0039fddd9d4026bf…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 09:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61c1ea894956acdf5daa7e97eff2f1c9 SHA-1: af382b370e2edd30915c2f69cf2bf805925fc439 SHA-256: 0039fddd9d4026bff4b66bb7dd92555d4e312fb09617c9ffae4d89a85e055d68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous links to external websites, many of which appear to be hosted on compromised CMS upload directories. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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
  • 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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57d5b86cd---pajazinileladodimize.pdf In PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/54271275590.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e80f1f99edc77067d50e2c3abffd8624/mudopalerufilibulibopukuz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t9u8qhio3fva6eupmv033ca62u/pitigarefosubumubuxijib.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a11e74b45---bapunojuwef.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccada76ab---96211916455.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/kogetimawo.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/83585507250.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/kukurupimuvo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/76670407481.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/6701873286.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210530092152.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29559cf907---zusedenokopedorom.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62d4eb0e4---pogetojorojuxasozarekoba.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/27511983924.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3c09ae156---kafoj.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f692b9ba---70271052699.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/99023998866.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e1a0c111---20493959043.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/40094143090.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/99920485541.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2e36670c---43679511343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bmw+annual+report+2013+pdfPDF 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_off0000c3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 11104 bytes
SHA-256: 23ade784ef454813393d39d2a5f7ad039dae150333ecda5feb2bc5cc10c27dee
font_02_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 17124 bytes
SHA-256: 25881c7f5fccce07eae25a752a44e9c48a99017f1b95edaf785a1cc984563837

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