Malicious PDF — malware analysis report

Static analysis result for SHA-256 be67b6f6f237b855…

MALICIOUS

PDF

83.7 KB Created: 2021-07-04 09:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65cce8376873026c8a7390b7559cb5c3 SHA-1: 11c7851788203d1348ad40885032043c9a67c4a9 SHA-256: be67b6f6f237b855b2687a6ddc46c791dd418a4e6b784f3f7da9a3f98640a503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41cpf4ipkeugggqrparvnbd454/69195296073.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609619423a246---jedolugojod.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/58763972936.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2rkf318llb12i2nrufoiu8bikb/68622490512.pdfIn PDF document text
    • http://abnicum.com/files/file/2921135883.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b42ac2fbc---83366692605.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077966584264---sowosofeninadekara.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609affa52725c---15986870501.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c38777d3---bixisuboxasub.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/velolovaletalamaboxiwomu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/vewisotame.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f15385cce---vidukuteditinaretagozak.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0a0e10b47ca16ee930653f33b04d193e/bajuravawego.pdfIn PDF document text
    • https://heyratacademy.ir/file/sojijefagomapunipupiwogas.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/buponepo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/609d7addca8a3b97a1429e6a1f924da4/62762387877.pdfIn PDF document text
    • https://bnovum.hu/downloads/14521652336.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54c1923d51a7a4b27b83c64b02c5f47e/nopelopesadokukosuwibu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/o2fsuco4ce728krkluri8iq2ue/zugudefoda.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c7719715bb54b42f35bb381c207b7db6/polukaw.pdfIn PDF document text
    • http://cycling-software.com/files/file/mogewag.pdfIn PDF document text
    • http://dhf-china.com/d/files/20623152679.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/73cd6335c44a069bd631c2db3531fd06/meromokinireze.pdfIn PDF document text
    • http://labonscafe.com/userfiles/zizifedoperusuzukotibaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=beo+previous+year+paperPDF 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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 10328 bytes
SHA-256: e6b71892ad1119c08cc59327198e94187c95166e9ce8650bc7f976e43bfa372a
font_02_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 17352 bytes
SHA-256: cef5f828b15c098149bcbc5c66249cb2e46f1adf1f8f502a0b7249d2f2079544

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