Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46f48cd21511df2…

MALICIOUS

PDF

68.8 KB Created: 2021-09-14 13:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd66842ac12b406b9fad229585d3d27a SHA-1: 4d2e823c9e93552f13f06e7a01dd3fed0d9d37b5 SHA-256: a46f48cd21511df238b16efb039881f27d7ca43741a0d4039efd9967c89d562a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. While no scripts were directly extracted, the nature of the URLs and the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130217f406e5---94918790581.pdf In PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/29143128270.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/zojuj.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xomizeterelanur.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913051624.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903072231.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/riveveveluziwelo.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/bulum.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/95074849348.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/wukunagadozap.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/wagutixifopiliwabutar.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa52504852---xarowepijifupediruzu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/78440134319.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29260432407.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/wunaradabedofusewurin.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/80099052727.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/memomefifejoxugoneparole.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb46007a0---22256145636.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/95298438269.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/mazatiluwipijimizasejo.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/89258570157.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/fafaxesaxanagotapanugebo.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/xesotitebipi.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/fuvup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=song+downloader+app+for+pcPDF 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_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 14748 bytes
SHA-256: fb50a598388c18642440c818dbcbf9b1dbb78bfe9becf6ae242e2b0f5e5646ec
font_01_sfnt_off0000d54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 10596 bytes
SHA-256: 6ffba5bd63c7cdb89b8fac3297abefbcbb8f72b7116e2101d25f0fcbc1920779