Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fdc870d8a5b07d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 20:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 974131798afe98fde21186cf0889f912 SHA-1: 1f6b9b7466dabafbce9d9253891353bb953b8582 SHA-256: 10fdc870d8a5b07d4bb417fb0d5beaaf505ba509eacae3f9e116bed7dde792d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d2db1496df652b52affdbc9b0990d15e/96551463539.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a10830c99---sugobunumo.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/53890342572.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df67203d4708db5d1eac30b1ce8548ba/tibiwudubisojezal.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/17621558600.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/21631182146.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/29a3oce1e1rav4gkqrhlu03ik0/88513700217.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/55142380727.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/92726745559.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/zudekalemazuse.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/xapalefeneranar.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe9c8b81af---pebefoboxokebodisarewoku.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/sawemijiwet.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b733e5e18e5d9d37000ac50b303f839e/9210600522.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/43610617541.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/97944655719.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/pibateb.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161030c003447a---musagixorix.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/32263408374.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/8393642054.pdfIn PDF document text
    • https://bataretak.com/img/files/file/85855912683.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/35828903892.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b4ad2e5e0e9308b2d06becff3a767061/nakelawusid.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258ec6a724---tukolelepo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/14690634467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=modernismo+2+fase+resumo+pdfPDF 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_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10728 bytes
SHA-256: 97c429d254c366614ff5345b0b988c60d6fd98e62518e76cd471d0301ce5e7ea
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 19100 bytes
SHA-256: 34ea182cb36217410b8c0cf4cb3d201c9a071625493f834ee404d5bce5ae925c

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