Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7e7dc95cc700bc…

MALICIOUS

PDF

104.0 KB Created: 2021-07-20 20:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c512d01bf9401918478b686a679f75f SHA-1: b6c1fd90fa22396830c94df9cddfd239600e8cd2 SHA-256: 6c7e7dc95cc700bc9e7a970b2f27bd14ed00f8d9fa533e9c7d7cd7ebcd274f86
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The primary purpose appears to be SEO manipulation or distributing further malicious content, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://puppometalli.eu/file/ronopu.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/622fa1662257369a46457dd2af913abc/pimumugiw.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/70983a805ceb27164c99662f8ac8fe66/75231793232.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/5143041173.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c683ca08ec0---97354404458.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/vagesugi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/96q9krbar6fvi4t3fgc57hcqnv/60296986816.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898cd83e3b1---71387546878.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/l7vtslgn344tcb638repvs6opp/16539216010.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63b2f2f60---21556329588.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b755d60caa3---direbeka.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9d09dcd7---72293550069.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4e749a240d3cb023ab2d1316eedd308a/81626866797.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pevuvek.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ff78a3b2---bakegogatib.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dca6317fb8d---96532912775.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160907ef04f6b9---vosapenatujukapaf.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0t7kguo891hnl77j632ogku111/ruvazotejusoseratum.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///60394001662.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ee74afa4---vutebupanidit.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/v97gtpeb9qmpsbpju2smtlm027/42079697860.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zigivefexifo.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/xudode.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/33b49f97106ac53d9436c03ec2374217/925117693.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e3f2d98ca77cbf04c9f14d3251ee2b1d/wujeroresotesapugibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=raymond+unwin+town+planning+in+practicePDF 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_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D75 11032 bytes
SHA-256: ba06ef0f0dee14d1fa674c02bdec6288a223e264e524fd31baf3bd7fd7247348
font_02_sfnt_off000166fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FA 16832 bytes
SHA-256: 35fd61376562b6e1445a10465535ead806035d49ab80416001390af796705599

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