Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b39db0a83c691a0…

MALICIOUS

PDF

79.1 KB Created: 2021-08-23 21:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4573da01d5b23b3c13abe44a01b72490 SHA-1: a5e6f89e2dc8fc457db50dcaf63ac7a726e46947 SHA-256: 7b39db0a83c691a0ad818ac20b8c58e693a2ae9e9f3793bf6c932186bb84ba6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, suggesting it's designed to lure users to external sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this PDF is part of a campaign to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cuatro-pr.org/sites/default/files/file/laxarebezotosedas.pdf In PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bavokusezulogafigatugul.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/labizovegax.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195890b13c---tutedebezojujivimepa.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a462ec20b0447ddd4a9d4f32233bb234/jezolip.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jugemaleduxon.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09307d561---17347113899.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/81546820793.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160789f50cac43---50575741108.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/boziga.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9ebab297d03fcbf532c5f5f48bab67bc/losetukikazatiwadobuku.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nepukobupo.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nebevo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kboel14co160qmp78l1i2f6mh0/jeberi.pdfIn PDF document text
    • https://securitydm.net/slicice/file/15615732577.pdfIn PDF document text
    • http://ladna.pl/user_images/file/31758621126.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b2c8a1b6fe589171eeb8bdd392de5818/1449948146.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74555c7eae---71835143775.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/bizafunipogavelilodu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/24474352483.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/pizaxujufib.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/10498565962.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/mojine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hardest+riffs+to+play+on+guitarPDF 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_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 16008 bytes
SHA-256: 16a7d6a41e5e204c53cb46da5004040a858fc7c16041130f28b7e031fdf2502b
font_02_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 10880 bytes
SHA-256: 309ca4ee4da55a1cc4b39db2e4125b67928d080e938ec38c2b9cc0a9715244f5

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