Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7394d6ffcd7d8e…

MALICIOUS

PDF

143.3 KB Created: 2021-06-30 02:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddf2ceba0f1d9a7b1badc51a5569801e SHA-1: 1ec3094bbb3cc2b8e2e310b89d94c270f724cdc7 SHA-256: 6a7394d6ffcd7d8eb86c0a550a26fcf66bb2957d6b19fd79abfba7323b85bbaa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://philabc.ru/uplcv?utm_term=eyes+grey+soft+and+metallic+song PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad3a0f94c---55967897116.pdfIn PDF document text
    • http://bronia.org/userfiles/file/47611002296.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607435c4b4d2d---wilavarinaze.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4033fabadc---bogawiwavame.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/41046058054.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4cb92d9e2c66cae186f70af6d03cf086/94032722254.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fizigariwavikow.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c982dbe0---24728792985.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/17071981976097b09775320.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076373345b9f---dilevujol.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/gajexufasabovapezavi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/62acc77b1fd7ec3f64a93e7f8337e32c/zavexotoku.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bdlj78b3c5fr7f4msmbmtmatnv/45063762757.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c5288ee818e60f51b832fc949d4b0740/35846699176.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5803fafa284a1ef6d8e42329c2a39706/91052838486.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/b1d0f0b260ec756f5ab30ca0f3302686/bezoliwabalojuwet.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/78015548022.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///reguniziva.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/bakajiboxavalonadiluxafik.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210628091731.pdfIn PDF document text
    • http://ombs.ru/uploads/files/jadego.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94554b520---gulomejekufuju.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_off0001cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBD4 19776 bytes
SHA-256: 7732fbf38126f068781ecf489ec96505d37e3abc14d1d785898d2b93f9ac418b
font_01_sfnt_off0001fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000216b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216B8 10916 bytes
SHA-256: 85a482bf65afe204fddb5afb0c58632b15d38302fb1ffbdddfc5a63ab6e1cb67

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