Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5704438755be87b…

MALICIOUS

PDF

101.9 KB Created: 2021-07-05 08:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1423fc6269045279b421117c96551dd2 SHA-1: a9844e818aba3cc68c858335a1a8e027b03a321d SHA-256: f5704438755be87bfc8a4dc773687f73d4c2b7a668c4ca42715c36c926fc3969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://huntic.ru/uplcv?utm_term=painful+stomach+ache+after+eating PDF link annotation
    • https://larrialdiak.es/files/galeria/files/pugivumulapuwopedumijejol.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/minipatilelawufazerogevop.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/xedajuxakomebeg.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/govupibexarokazizokabuda.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/68683554100.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/lexijabolavezofoj.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/65840058452.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1i52kf2sk2f73fg1ulado0lf00/77214798375.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c619ea5b---pevofigo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/523e3b668bc7b1883eb04457177a5eda/xurixevamijofevesatake.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/nebibaduzafadabe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d55ce16fa---3149609711.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/tirunebawomavufet.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/20427514907.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/55823950132.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/37889252540.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/14539264460.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f71ae33d9---48765310008.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b016625bbd2---79094826534.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2cfb8650---zufate.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cfbd649bb42a5fba29fb244ae5c34abb/72259749114.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/l41gapmvae8638ctldgqfnlenq/vasuzamigemujaninakib.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_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001444c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444C 10884 bytes
SHA-256: 72cf5a199ff01e6f8506810fc353f801abc95f03d1ed66237b3adf682eebb509
font_02_sfnt_off00015d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4D 17268 bytes
SHA-256: 138488ef98324f346f35b637c43cdc303621b1be9906db7de052abc303260f67

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