Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fe2aa79a7d4f15…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 14:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b46072f195b1e6ce83c5a6d798664f6 SHA-1: 34dbeaa4f8d45f9d4588b265c39962a1060d616b SHA-256: c1fe2aa79a7d4f15286f0dc556331508b7a1480a459021223d9c671893bb6df2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the link farm heuristic and the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://celebicatering.com/upload/ckfinder/files/zerazazisigotejemogu.pdf In PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/lebixomamimot.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/02adc9d52927c4341de5ff15b785dac7/delosonogorezib.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9806d7bb---89519284604.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94bce0931---89375796207.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e3fc640299bc8831edf935b6e92e4269/fojaxik.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/rikaralajesuzamofo.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/90297542481.pdfIn PDF document text
    • http://elitvorota.ru/f/file/wudifilumasa.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/73889900154.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fesigolusofojefojad.pdfIn PDF document text
    • http://annabarons.lv/files/files/setejo.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/86927090562.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/53963096399.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1722b5d178cb642efd1f524c10b055fc/vunatatevorimimasovitugu.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/52113960183.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f9397842---33968089601.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/85798fb893582ff02a244d655f1dcec8/99187374327.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/biguritoxoso.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/60058152844.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/15935151051.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/dotaxikolozofadudipatur.pdfIn PDF document text
    • https://turbooto.vn/upload/files/nubusukenofenekixu.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/riziduvukexaruzok.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/27469432836.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210903_100435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+do+the+parallels+of+latitude+and+meridians+of+longitude+together+form+on+the+globePDF 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 17848 bytes
SHA-256: 78cb2417f17a1176e6c13a657796b5bd79eb4aad375ff0ba35c35d256a6592fc
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 11180 bytes
SHA-256: 80b10e4f92048204dca2b63393b695795b05d887b8c8e558fe5e7d8b3bacfe7c

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