Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff2d1294a24a2cf…

MALICIOUS

PDF

70.6 KB Created: 2021-09-08 00:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: adda2bafe832e81c133ba67c0ec2a403 SHA-1: 10e99b3c586b595f24292ab90dd1417a9f4efe66 SHA-256: 5ff2d1294a24a2cf0eaeb7c20d2d2d52fd2ccc18b3342f5ad7e22a2acfc09548
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns point towards a common tactic of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161121d171d3aa---86455052615.pdf In PDF document text
    • http://myjobcareer.net/userfiles/file/2021052006215473499.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/55760695534.pdfIn PDF document text
    • http://orlickachata.cz/files/files/vaxewubipedog.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/96458413428.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/norumubinizozimu.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/8665869784.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/dejutebakorediwozubiweje.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f004a9ff852c31b90c44bfc254484489/rigegodirovojagateven.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/32626330780.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/89009640802.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210804064703.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/lolajimavadaxipurug.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xazesapukegabibepop.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/mapikurojotob.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nejivugopigoguvojuvag.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zurirupopezaniteg.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/gapirudaniponepawul.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174dcb7944---zavuvijinapa.pdfIn PDF document text
    • http://distributoram.com/files/file/98978089844.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1ab4ee639e5127a3d5da8ec239e210ef/wobirisuvuwotozeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tcpdf+error+%2Fstrong+image+unable+to+get+imagePDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 15708 bytes
SHA-256: 2df54460b0206ff9f1cf0bc0730cea74e0bc1688c341cf463cbb756625aa7d0b
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 11200 bytes
SHA-256: 729a5d410c526f7561b513b8ca258a9fdd574296d7156e7a4cea8611ec4a7c47