Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff1b7aef4feb097…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 17:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53ebe1c6176f1601c0bebe989e7fda9b SHA-1: 6409c7eea8822b43e3797c81632a3730772fb98d SHA-256: 5ff1b7aef4feb097b7eb2fca2861d11d9df3fbdf0ce6ac98092b0b502c76b37c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of PDF URIs and the overall structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=digital+filmmaking+handbook+pdf PDF link annotation
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e734ad034fb73a085a922f0fff7190be/19979536062.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06aa26d355---42360501540.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210601143644138958.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/momunotizezirafetuwe.pdfIn PDF document text
    • http://hydrem.ru/images/file/78591650220.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/zatutejimop.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/17732465131.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/97867844109.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/kotorate.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb26c6d8c83---fumolowobavepidubenogi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070407183173499.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5p5ek04brhqa87ueveupf1ltj1/93607872073.pdfIn PDF document text
    • http://szm.hu/userfiles/file/93344290455.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98361e7038---45832431819.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/68836259397.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0da53b2c---18120087375.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/telerutukamol.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/92019710114.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3253750e---jojaxuxonox.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/98990384993.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/887ad8ec4e4b52673b6ba10c336f769c/99177858255.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/34259766827.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/f5840l9kqt801n0mlu4sh63f46/divilajubiwatusogu.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108120556569386.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/38678055118.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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10776 bytes
SHA-256: b5c72d6588d6f2c839b3badf4d5c3530ddb932f2978ab7ee9d46a039eaff9ecc
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 17016 bytes
SHA-256: a34018c1ff2906317538a6a24f90855def062dcea767c5d6b042558efcaf69c4

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