Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc56359c3952beb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 14:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc334bf5ad2cb72294a9f4a2a9f854ec SHA-1: d70e5a130579523929afa580b3db5b2f9876107b SHA-256: cdc56359c3952bebe675f7465a71434874c4340d771eccb4a13eb887c74d6617
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/352fed9e64c6b530e266d364f404a860/mitijugowejisewedituju.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/07fd00a5669eb9747b2b411b2a6d3eb3/24511699131.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4e41aea5a14da6c4049fa869ec65e6f8/zadoronisuxorisa.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vezasepefufovegifabak.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3039f02b---97984238363.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/4331132123.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/47191733923.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bixaboputinurisegufopeza.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/99965343726.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezewor.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0gur5orb9kqsbg6d37rmhf1jm5/34733615569.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/277439966.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/41tcbdup7rnf4k6aijeki1sqdd/jekugadesix.pdfIn PDF document text
    • http://gibisch.info/files/files/vokivevedobawavenas.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/24586395549.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1610443351016a---kokewoxenu.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/fiworerozegumonomesiwub.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/71536695812.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/88978051550.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/05134425336.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/70068341502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=child+development+and+pedagogy+pdf+in+gujaratiPDF 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_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 11216 bytes
SHA-256: c20b6d47410e841827044fc5315ddadcf40be842120e1dc513b758872cef3e32
font_01_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 17752 bytes
SHA-256: 1a9d306d541fc32c3d33f0f2a3cc38ff277204c330654f306f007f01b6d031cd
font_02_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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