Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c127e7cb556bfad…

MALICIOUS

PDF

86.0 KB Created: 2021-08-14 23:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28bc4a649b63f5c1083974451da4de87 SHA-1: d6bc208858057d18a3300cd9f6abb9dccb4b2037 SHA-256: 4c127e7cb556bfadd6b16b247dfdabe22436822adaff46bf805542c49e5a284c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites and disposable hosting domains. The primary goal appears to be distributing malicious content or conducting phishing attacks through these external links.

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://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/48901114774.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/727e39e04adbcf63a7b4c211691a6dbc/mebopexewumugo.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e4dd8f6ff1579c9ee113b7228358dee8/80763669656.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/vobvgi90snicp9m6jsoc234sgq/buxijogiresalupu.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirosutakuzodulozabeva.pdf
    • http://hoteldanang.vn/uploads/images/files/97568067082.pdf
    • https://fnb-concepts.com/images/uploads/files/76020046685.pdf
    • https://victorybear-info.com/userfiles/files/33577393502.pdf
    • https://carcable-bg.com/uploads/pictures/files/kofuvurigexeze.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607718cbc9269---6451358380.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d09144bc3---nuted.pdf
    • https://childconcern.in/trila/userfiles/file/9756189489.pdf
    • http://khocabien.com/uploads/files/dutakin.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/22b0943p6dakk7kc7ovd8lkpq2/felezo.pdf
    • http://hajnysport.cz/FCK_userfiles/file/11076282271.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607821395654c---67197889440.pdf
    • http://www.centralperdana.com/file/berasogixuxubazilob.pdf
    • http://alliance-ic.ru/uploads/file/pasepepozowowoki.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/hln3e4v4i38mh7me9mgqif7hao/24079382574.pdf
    • http://elesi.eu/fichiers/files/80764051907.pdf
    • http://navigator-33.ru/media/file/rotofarugivipomirojofa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cu%C3%A1les+son+las+s%C3%ADntomas+de+la+pr%C3%B3stata
    • 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_off0000ebad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 16792 bytes
font_01_sfnt_off000103bf.bin
5e44b2b5757b3b12f5399d1724295d935f0a0f61dd46fdebdc1b766654cde507
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 17360 bytes
font_02_sfnt_off00012f9c.bin
78e6e9337803f5811883a245a6929146fb459a2491eb44c8051657c6832e4bd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 10972 bytes