Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b6c9ddbacd7d0d…

MALICIOUS

PDF

76.4 KB Created: 2021-08-08 16:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f505a58b43446b580fa562ee42433261 SHA-1: 14bd06fdff83f6d1b32ac36ca9429c44cce36e16 SHA-256: b9b6c9ddbacd7d0d7ad9955594d62ba076a5b31b559950d05d0c3493fa723625
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous external URIs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=ali+kundilli+2+izle+full+hd+tek+par%C3%A7a+bipsiz+720p PDF link annotation
    • http://zigzagontwerp.nl/sites/default/files/file/sisigosalovule.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9njpa1f5bgpnvubdcup50sv0k1/juparusewezinerav.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501073539137697.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e4e4df723---fizodofuxifokewik.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32695479079.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/58548674486.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafc778116---wupelonebe.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/72112808890.pdfIn PDF document text
    • http://bakoca.hu/files/file/22231914217.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/winipobopepinoji.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/20716438329.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3n37k3p9tfsv1hr7s58em9u6vu/24664801559.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/fufali.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d0f37693f36767a790dc9f435e9bf790/43394326974.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d5fc43f5df429c61843f6b9486df46c6/12198139636.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bupezimogatofitewuk.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608a71cec4b94---57454307036.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gupositujisebugak.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/18345474710.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/12642281295.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36203704950.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c58c83a9df5642904670cbd931b5021a/zikiwulejefutubevo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/867c9d0cdf933668b8d6a5f1c98141e5/buvovozaweloxudo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4ed0493645db45cccbab8ebf90487f94/dapavilafafel.pdfIn PDF document text
    • 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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 17152 bytes
SHA-256: d5da63805a1628779970cc7474c1374e387606ac4b4b14464108f15ed3c1e45a
font_01_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 11336 bytes
SHA-256: 11f79fd3a1cca3bdbeb07bbfcc02fd89f01d5df6a5c02a1f0ab6bcce60032fa6
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1