Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01d532f52d2dbb4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3dbbd60dfc248284ac9ac2ce95d65f6d SHA-1: e5bbe19107869458a58b6ff629c2b00ad5440f86 SHA-256: a01d532f52d2dbb4e84fc752a21660a50436347217fc417defa46231e184e1a3
184 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 detecting it as a phishing trojan. It contains numerous links to external resources, many hosted on compromised websites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=fillable+wage+garnishment+worksheet PDF link annotation
    • https://praktijk-fix.nl/userfiles/image/file/10004013079.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/77775667686.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ef16deefb68e30fc1ac6b4ef7b7b0850/15722930765.pdfIn PDF document text
    • https://aitalk.vn/upload/files/bepus.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/18766411619.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/18652062687.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/vitetewug.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/27040461569.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/depubawupatetaputugomu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378ee31c92b---sisedewezasowajisitojix.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/gurafowazarukofosukova.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/2743940021.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/60608262798.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/xutuxujezamerofegin.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/4656404714.pdfPDF link annotation
    • http://chaukitchen.com/uploads/files/kaset.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/vifomadakituliz.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387c347b89e---76420483989.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/narivoril.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/tubalopenasu.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/fosenepobuda.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109050832229033.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/jukagasifiteg.pdfIn PDF document text
    • 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_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 17240 bytes
SHA-256: f88c4f9ac36854df592fddebb3547d60a6b1e631a1bb7046c7ef4175f8d134bb
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 10852 bytes
SHA-256: e9399ad13299e1fadc61c5098f947bd09d2cee1115ccb4ca9c1242a3f01e0f09

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