Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af7cd045bf81492…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7b3fad66e19a79fa4ef6a20dfdcd06e SHA-1: f9aedb45ecfb81ec8f3649e67e6fc07405eb0944 SHA-256: 5af7cd045bf8149268de5d29693aa605d79784f93d990b1d05abcf4deee623e5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dinskayarealty.ru/media/file/24686874879.pdf In PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/busurexifakafadixukobe.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/lajunobalokobewawov.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/38897230328.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be859f3ffa---towujobirenexasatebuji.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/54190686632.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hj3g1ju5jhi814vgv2q4h1m17n/kijunagusirejawiboru.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/60947959125.pdfIn PDF document text
    • https://ratosatu.com/contents/files/sonejoruwekotidu.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/29683507174.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/fajiwapuwuwomasejakejof.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/96479221936.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/67891034912.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/megugifefi.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/fadumujada.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/87696630626.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89d4f2adb55a5415cccb639d928acb9a/61716604785.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/lesevujef.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314df076103---duvesetidaf.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/dusazupegim.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/sofusi.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/53241488948.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd17d7ac49---fekasolexegedonij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=emoji+apps+for+android+phonesPDF 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_off0000bdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEE 15712 bytes
SHA-256: eda33833e40d992b2ac82ffea819a528f0363a1ab0eb6ec33e05e77f75aebe16
font_01_sfnt_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 10732 bytes
SHA-256: 8c1e34047863bfdffdaa6fd0c8f17c8c8dcac48b2f34418b0196b738d422fe1c
font_02_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1