Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec5903976969644…

MALICIOUS

PDF

94.8 KB Created: 2021-09-04 10:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc956730d8015023e908d46e30e3d110 SHA-1: 34bea4ba609eae858260e95a87bc5ef00bab3f27 SHA-256: fec5903976969644fabe0e6640b438b2f67c25b09080879ba408f4cf33b088cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic firings and numerous URLs point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=specify+worksheet+range+vba PDF link annotation
    • https://inncredel.com/uploads/kuwevofup.pdfIn PDF document text
    • https://tcremich.lu/files/files/44367890172.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vozaperisor.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hkqk906ioi6kr70hpcml29deo5/buvixetekogufef.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/12170192045.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kolowi.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/dujabo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/21126f3788bb48854d3f47cc36a2828a/41418146562.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/lozedaguvozogusilimod.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/93504492924.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27da6ec7e---12360309172.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/58512461686.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/xinivo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160856e5620c9d---dufafatesejumod.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/86889371699.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6df56b8ebab6dd8577cc4751b0e921ab/liritanabitazibopofipez.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/jidozekamudomusopebavif.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c1bea046---lubijadaf.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c53149dcdd9c4eb3b440240a70bd9e9e/95787008056.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/bubel.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892f92df338---nolatepugamitikoromik.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/86550304898.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/tikevat.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210510100055.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/73209216958.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_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 18812 bytes
SHA-256: 3e2256aee17e0544bb8306a38d618f0cbcf393dc8e8745708c511121c8f5daf2
font_02_sfnt_off000152c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 11284 bytes
SHA-256: 1077b3273bb3c62289e77c1306b0be9af1020da205f099b094eb4d252158f4cf

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