Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c51fc44bf232a24…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 21:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1af350dc50218db60751b8d3803cb88d SHA-1: 973af44b51b5f716da176de6048db5600e2807b3 SHA-256: 0c51fc44bf232a24e21ad7d58e22cc7540bd1aad08ef08e665843ba5fb55d203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allytemp.ru/uplcv?utm_term=how+to+download+lucky+patcher+2020
    • http://hagelkonzept.com/userfiles/file/begorelo.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8fc1e066b799f9ec923e5e1d369ec6b5/badebibawujajukugoguweke.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9c7767bacb20ec727a12e4f41dec2aa8/vutupufiwizore.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/movas.pdf
    • http://sbstroy53.ru/img/files/38303245395.pdf
    • http://asqcert.net/files/files/pesetudizokusozisixul.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2fc170370---lunuroxexak.pdf
    • http://adria-ex.com/images/blog//file/wesuwilezegibinepag.pdf
    • http://ezibra.pl/upload//file/rexeranej.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbb298db19043d45548b7bb1e494a47c/pibezawegarimazunufemakib.pdf
    • https://artenika.pl/fck/file/mipobik.pdf
    • http://cuakeobinhduong.com/upload/files/93622148565.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608647cc5b0ad---50002233732.pdf
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108141227115226.pdf
    • http://yasaitogo.com/uploads/files/33376198132.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096206657b40---gamukowuworuk.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8t9uj9rrbndalllot4goqjnc1e/kowejujunukisedu.pdf
    • https://yesilkoyluleriz.biz/resimler/files/levadavujadakedab.pdf
    • https://hospvetcentral.pt/site/upload/file/70804831374.pdf
    • http://architettosirocco.it/userfiles/files/lufane.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ba281900---23257334319.pdf
    • https://condicionamentofisico.com/arquivos/file/lirisuzogomorof.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9248df50617fd40d4298929ec57793c5/29934641571.pdf
    • http://kiiga.ru/userfiles/file/77416497755.pdf
    • http://katyababash.com/images/uploads/file/75032710337.pdf
    • 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_off0000d5a3.bin
79665d5ffec5953f7f862a6f39049aa33d600a4292d7676fc83ebd44463b216f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 18384 bytes
font_01_sfnt_off0001051e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 16792 bytes
font_02_sfnt_off00011d35.bin
c469a105b8e1eac7bb531d8208398923f3084d63c77568697866f57254828812
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 10976 bytes