Malicious PDF — malware analysis report

Static analysis result for SHA-256 104726360a38c095…

MALICIOUS

PDF

91.6 KB Created: 2021-09-03 14:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d908d66087cf8b694a0b91296a111a70 SHA-1: afb5849d88dd6e612b0bf4d203b17051f1e968c5 SHA-256: 104726360a38c0955e1a4bce1d59b7d360136e228c4b60a14dc0ef1f59828983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious content or further infection vectors. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=frantz+fanon+books+pdf PDF link annotation
    • http://yejida.com/userfiles/file/46321141132.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe60128f32---67318817881.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/1vr3kduo6sbc732kms6vr3h85f/xijoporobirus.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fcbf43762190844abcf36fec0d5eda50/99830290264.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b259216a3ad1f69e0e511932b9450b82/naget.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888ae3d8265---38188320857.pdfIn PDF document text
    • https://zzhqhi.com/d/files/40928440477.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/28749342043.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/14c81bda3f33f8dbc4e28c344382d561/17603060020.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/58954111451.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbe184fa8---58434878706.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a130ab7cf8e---29168364423.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/8fu5ruid6k199gakcpmaqojoir/71743197478.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f75f74b059a3d62a0d109cfe4fb17cd0/86601612110.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/64343082756.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160806c2d89a12---kuzufuxerewib.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/008e7f8688df769340c646fbc3748590/68711360944.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/48300162598.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6e04f17619ad9f3c5c5af1dc5d0fb024/71219102956.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/66450159365.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/lofuniwararunodujugagil.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/kasowarorifutedejofewum.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/90916202878.pdfIn PDF document text
    • http://arslanemlak.come/file/63992402755.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_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 19100 bytes
SHA-256: 1d776f9ee7d81f618f6faa429943c73c8437832b3224ae959ba927c07fd69285
font_02_sfnt_off00014790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 10488 bytes
SHA-256: 48014ceacfe67210c387e2e6031e53e2e9dd9a37d595fb52610d4ed6534c77b7

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