Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f22958d79894c5…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 21:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f67ace5617c867bc4512030674282be SHA-1: 098d4161da8f4b7e8e5f523d674da6eda14c9ffe SHA-256: d8f22958d79894c5e38f7b2e668bcc36d33f5bf5d1068487078d9c29d7e00c86
176 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple links on disposable or compromised hosting suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://havanic.com/cache/fck_files/file/58174356007.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/bc1b267629e4b0b80ea571ef2a9d660d/13587739647.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f9d26e51a1d05a0012a99b354c008bee/lilagogoput.pdf
    • https://codecs.ro/images/file/81533296921.pdf
    • http://fructusartis.com/i/File/17651487757.pdf
    • http://ruihuitax.com/files/file/65014046096.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/66708813a872e1ae7457661e18b8f167/16184411718.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160913756d7235---99915216234.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9e77a50a---33951505550.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b8a56f82e9351cd303b89508b43d5c15/siwagobefobivijo.pdf
    • http://nfc.soo.jp/file/29087270962.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8fbcbe78---vajavajiviwi.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c9144ef93---jasinakobek.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kcvo554drfbs0kqui1d5ae0hg0/buladofezunegovuno.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/fbe7aa943801f817bec9d52ba8999760/zinuzu.pdf
    • http://travelshops.pl/userfiles/file/48588732251.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/7c7284e412457166f3722399473b0eae/70355993938.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8411e5711---21332361092.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2c78ff14---27011662535.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcced7880---44349006696.pdf
    • https://vieclambanhang247.com/upload/files/lobunazeboxul.pdf
    • http://targdenunti.ro/userfiles/file/66333231937.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l4gl2r31vn78c9bfo1pei1v685/90258226347.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2cd90779---guxet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tamra+and+shannon
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin
1a4e886a2e38c109df6b1f4ad9ff8f0dcea1f2040bda3844b67020b16070c0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 17948 bytes
font_01_sfnt_off0001201e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16792 bytes
font_02_sfnt_off00013835.bin
2f5d4153ffbe70d2186e7465f2fdd69d7dd8a0a63ea6be1d27886a73167d0309
pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 10108 bytes