Malicious PDF — malware analysis report

Static analysis result for SHA-256 c748e686f3456060…

MALICIOUS

PDF

93.6 KB Created: 2021-09-10 16:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 130e4d8642ca40cdc49ca32aeec15de9 SHA-1: 5b82e4b4f8bfa8390a7d5b32eeabf57f47be6cb0 SHA-256: c748e686f34560605b9f1c8a10bb4bbc29ab8236888011ada0e73ed294513eb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://royal-pizza.eu/files/file/47170753495.pdf In PDF document text
    • http://gaineyranchaz.com/userimages/86733658440.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344ffb1feac---pinivetozupakix.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/84307132004.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea0e2dd745e736343d28e5538151c349/sulagusuludu.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/nesulidogogobovutakuzeso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d5f3a53a---53294338528.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/88236478965.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/42042309029.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/72037340044.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/wavalejogurab.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/tajawit.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/12788494300.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/37215309915.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210907_05045928FE05E054.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081626295229.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090506313873499.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020202433126.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/11182553386.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/89486161647.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kkjmovp95r0kstorlq2ltqbd33/89302135621.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/85235774527.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/98600319763.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/74608359432.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f199d29ae091de6438abeca9c7291480/1792990796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=principles+of+marketing+kotler+16th+edition+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_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 19220 bytes
SHA-256: 2fd771d95b2c0c8da29f944c5cb40ff5e9aff173fe7ac02fbc5f3e40fe12e330
font_01_sfnt_off000135e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF9 11380 bytes
SHA-256: 4ccfe7d8048ad4fbc178b8935bacec1c13b81bc865c4eaee2897df6d0d68db5c