Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff39c073c4f9d06…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 17:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c37ea6ad61c4adf421a039f8158e0bdc SHA-1: 303b4d13bd9e233dd8ee9cd4ec9220cef6f2a293 SHA-256: 5ff39c073c4f9d06e88e147585183a0fbf2d4886336b03b8a1ed84d47fae58f6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on what appear to be compromised WordPress sites, strongly suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://espicycooking.com/files/file///ratomabi.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e5iej31g04olqfq3upk7qfrvsf/88303827872.pdf
    • http://yuha.be/_files/file/raxerimubep.pdf
    • https://harteron.ee/userfiles/file/46681434952.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf09h4ksm43a823sc707hrigsg/lujirupexuzurubidujimapa.pdf
    • http://baugeraeteverleih.de/benutzerdateien/xejoza.pdf
    • https://sbsoftware.ro/admin/userfiles/file/kidovalugulotozuvomabed.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/22255351739.pdf
    • https://limmaginebistrot.com/file/4410087989.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3rqmbftg74k5js4b8srv21tivo/18128733507.pdf
    • https://aronabritcan.com/userfiles/file/56521036646.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a58d2693---44641005584.pdf
    • http://tylincms.com/userfiles/files/93182789091.pdf
    • http://jplus-ag.com/upload/files/BodyFile__610413A0A26D2.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfdd151c47---86710903095.pdf
    • http://samnakthodrahassob.com/userfiles/file/37532944382.pdf
    • http://grafiport.com/userfiles/file/45688859632.pdf
    • https://uclerbaklava.com/resources/file/6578261658.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/015b5c45ebdd1e23162a6a602eb05a64/wavirazelojoretis.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/76203953d69043d88cecd6ca32dc65eb/nimikobamigal.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/102093866760a7c786a2f03.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/tokakulub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=burping+after+meal
    • 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_off0000bdbb.bin
085be67b26146df7351200594762c9d4b6b246de05fa5c5556d1d11c2f49d07c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBB 16580 bytes
font_01_sfnt_off0000e835.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16792 bytes
font_02_sfnt_off0001004c.bin
b5b362897af4ee9a803266b4d2369ed7f8ea0f03cbb2008f8712190c569a7d7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10564 bytes