Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d909850d2d9c81…

MALICIOUS

PDF

80.3 KB Created: 2021-06-29 19:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d00f65e41955f3f7030c5125e6041aa9 SHA-1: cc87757bfd8d5685914e7cfab076e24519439347 SHA-256: 74d909850d2d9c81ad389e07db2fbcc733e9b9fd9a68562c8d725451f8549683
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The presence of numerous external URIs and the nature of the detected heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf0de07d7---titezawivala.pdf In PDF document text
    • http://kinocosmik.ru/sadm_files/27264207807.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc795bd2a03---16109574934.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/33472957343.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c784136465---poponivagi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/58285303564.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/rujadafufa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1b654b23e6f88f351695a619e95f7aac/64129157067.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074634c3e392---97891989966.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c98d0a0a29e63448213278f80537aba4/77123187978.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kujizeraw.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/77359573970.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/9818172457.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec77ac1a---60727405072.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/63594dd764731b288193a9317e9dde5e/23862063953.pdfIn PDF document text
    • http://indecomavo.pl/inc/65931715411.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/fisaxinatotenot.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/47248378032.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/negomugisunuvuxewomup.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e6d853f1---rifowosepe.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2a228njqau4pt74vv6olfuvlp5/40401493018.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/mavexuxelal.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099596ebe5b5---jejasugege.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0dfa1cfe620f5e0992c9cdd84cc2af57/11955144368.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/138fffplokf3comutvfkb1e61n/balunibotekuv.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/39423157369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+bisector+of+the+vertex+angle+of+an+isosceles+triangle+is+perpendicular+to+the+basePDF 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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 16636 bytes
SHA-256: a6bf49354742f507f29f123b569c438d3be873aaa505d5fa67f2367aa574c638
font_01_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 11272 bytes
SHA-256: ed56a09398e214ace5e0d9b950df5d9f597b40778ef30566976326b962b389f8
font_02_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1