Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca7c9e4de82e46f…

MALICIOUS

PDF

88.8 KB Created: 2021-07-22 00:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 853938b1c7f41dae3d0ca8daf5a6737a SHA-1: 63c372b8f79dfb01ff0255273b3f1733f7882643 SHA-256: aca7c9e4de82e46f6ed5f81081a99d6d8ba3da0765826e3ce0bb4cea59935320
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://atpl.aero/ckfinder/userfiles/files/94819017932.pdf In PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/43830215992.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5642q429hom487kbmmuel1gfm8/nikidisemaxetugowabedi.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c432982f7bf8bc07dce1298c1451ae91/28756888967.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5fcc1538b601a81efb7c98a2ba8d6f41/pedoxezugojifixawapaxo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d0cd9411df3153683432e73cf3e1c49c/nobesinekukefufolisen.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/88510163594.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/fiwizufupilatefa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c78ad297---mirakuzozujozeroxod.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/61749182044.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/r7c09cnt2n1m7j5uj5kcpot836/rifarozopik.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c2fcd5d5---roduferakaxotigujus.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/79275342463.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/sijojokusatan.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/tumutobakugupivuwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4402271f3d---sapunesedigelid.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79fea74065---83737932427.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/78323903312.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/97ea0dcfee764ea454728c4614c2b1b6/99126938745.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b595ee15e3b53ca8f5e49c0147e2246d/16012698792.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f8cc88b2297ed56d62d2de1c38cc8bd5/77201992791.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xoxijowepupuwizijemex.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/31599054141.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/8490586403.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/63371528084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=idioms+and+phrases+for+competitive+exams+pdfPDF 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_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 10956 bytes
SHA-256: cbff5c0d5b043221bb67bb899ef1be7b97a6f244192f40b549fe307020d514c2
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 16612 bytes
SHA-256: c02f84a0c93021d17968c50f3a8d05ac6031ec1642e1195c2407fa0a9b1821cf
font_02_sfnt_off00013cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1