Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7801eb1c4fe1cdb…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 01:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64cfa7979ee33fa7d6bd9b95660d2e79 SHA-1: baab117d67ec780e6fd6d9335afb1d8c89f3cd04 SHA-256: f7801eb1c4fe1cdbf2b86e4ad31009f303d3332e9aecb50b7e4d78600982b0cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29154e6b5a---jefusunizisowu.pdf
    • http://1night2daytour.com/ckupload/files/85027902066.pdf
    • https://resonanceacteurs.nl/userfiles/file/golitiponuka.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8f946875---bufepuravodojina.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb6b42fc6---bibepiv.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960cf33b760---7024012359.pdf
    • https://lesfeesdelhetre.fr/upload/files/mepipuj.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/853cf732768dca03541151e8564d4e8c/fisofe.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077e30258d2c---14172740947.pdf
    • http://yaeram.com/userData/board/file/95551179198.pdf
    • https://planet-pvc.com/upload/files/lepimabezopoxiwatoxer.pdf
    • https://sca-kc.net/scauserfiles/files/65558533409.pdf
    • https://steklo-shik.ru/userfiles/file/12351908453.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9c8440609face8abb0bdfaa8e4fcf746/fuduxotifemuromikunotalax.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d7vjc6gh1ti6lvj3gfbguafaaq/fukemekutelojitewexugote.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe6644fa9---19940580243.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d2edbc571---zedepifaru.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b971507590d---gedupovupexedupison.pdf
    • http://msslink.ru/userfiles/files/patulikojiseta.pdf
    • http://marty-triple-m.ch/inhalt/files/wofivejoserujuzavuvalowus.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d18328ab8f9---20149527600.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=divinity+2+the+cursed+ring
    • 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_off0000f343.bin
e15d998c0e05327b26cbc76799e19f9050eda231974d90f06952311f33a2f472
pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10720 bytes
font_01_sfnt_off00010bc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 16792 bytes
font_02_sfnt_off000123d2.bin
44ebb5694850b1de40357ba7b179e92c8a68a3e6949d23d7144f47c914fb84f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 17600 bytes