Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a341e00bcea7fea…

MALICIOUS

PDF

100.4 KB Created: 2021-09-04 22:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39ed95071da10b307915bca1c9365082 SHA-1: 3c9dc5baeeddf4298bbd49a905e7d6295c9c9c8c SHA-256: 4a341e00bcea7fea7f406a2cc3f27c66e6a91644d059fbec9a6da62d9bb94a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to compromised WordPress sites and other domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the ultimate destination and track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=concepto+de+pluralismo+cultural+pdf PDF link annotation
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/53676d827e191edadc43df03831bc060/12005735184.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/vilejok.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2181d7d3---zaloxafid.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/25001659823.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b9400875---ninuv.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3a458447dd448678d2d66cf3f092dc22/48486590542.pdfIn PDF document text
    • https://cowik.pl/upload/japavigibuxu.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/kutabawezuwezixapexus.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/tetazowuniraj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b819576b33---kujaxuvobadujarimenunu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4396579381---wavujorojosurodixunixod.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c10941400---naluta.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a358dd18b4d---48953854203.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/51fc31d02d8ac9322c3840e590cd01c3/35162259891.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/wimituzatukud.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/47voit8i2ohp8rr9l7ij39saca/gedokesijulojusanem.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/52967540087.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/dipupebogij.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b13cfd88239---99035081299.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052722565979.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065852f07ed---fewuwaxovo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/50033339459.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/piridunutugomadedud.pdfIn PDF document text
    • http://p-energo.ru/content/file/17066211207.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86656ca0---pubegen.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_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 19668 bytes
SHA-256: 5ee2101e31010ec7a590184294da90d9cae4fba057a359e0d807ceb34e27a69c
font_01_sfnt_off0001525d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525D 10912 bytes
SHA-256: 1ce72d27c72b3d4b49758c18e5adf604e80db4998231fb18ef33f29819b6c8e9
font_02_sfnt_off00016b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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