Malicious PDF — malware analysis report

Static analysis result for SHA-256 341eda27e83b1d53…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 14:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b48b7d9a5bbcbf1f65861a6e744cb94f SHA-1: 50946885e8ba11bc3879328249472593954b0a32 SHA-256: 341eda27e83b1d533c30c773c7a1ba9762a31b81fbda68c02a28e701e2ccf207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1911af427---fijesoloxesukoreziw.pdf, are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48971a418d1c84ce916fe16c2256cfb3/mawoxivolurore.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/af0a2087dc7667a6bc16565ad29b6f49/paboxebunemorememuputon.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/99aaf97c848f34365dd65747806473a2/xofufomi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c444c8c3101---79591573900.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87cfb96ad---fuvabemedenam.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/45752873582.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/5heg2cad20ug8ldt6n54i2mm8q/geguju.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e2c8e19b---ravurezuwalabowunovilawox.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1911af427---fijesoloxesukoreziw.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/suwarizukosaregu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/fasuguj.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/6533841792.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/42289888216.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/tataxonibur.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b34999880a2---47761501930.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160775521e4f6c---96328834274.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/v3pl58aebg6kuqlf14lmtg3p44/45202666135.pdfIn PDF document text
    • https://nada70.org/userfiles/file/44891799786.pdfIn PDF document text
    • http://capital96.com/userfiles/file/fakarisumi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e6482cf0---vowijosijedan.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/33058540225.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/91416886209.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/40014732222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=math+word+problems+with+answers+and+solutions+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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 11084 bytes
SHA-256: 1a10f1153de0f0bf6418b7e0e4f5270c881dbe85d2d6ec8acd87a3e93786c000
font_01_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 16604 bytes
SHA-256: 5ca240568033e24cde09e710e7805d2b74bb3b2fe702e44cd7017c73d45bbe40
font_02_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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