Malicious PDF — malware analysis report

Static analysis result for SHA-256 84de88a85633d453…

MALICIOUS

PDF

91.2 KB Created: 2021-08-05 00:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49de83b5d05149861ebc89abca081dfa SHA-1: 3852eb1aaee84ab1f8f27cf5e6160c0609f16cc7 SHA-256: 84de88a85633d4534707a4e1183c8fd7c00a4eab57ac9948bf3f9e763442cb8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=how+do+i+set+up+airprint+on+my+canon+pixma+mg3620 PDF link annotation
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b776b961f1f---17314183062.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/kelazizuluzavagijiritix.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/55311139504.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/65c6e08ae44c441812f4b76474637e76/getojimofu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7sdknmg5n0jdhicfq0aee8o64/zegudojitonovekotalez.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/44859999981.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/zupinepokavowejo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d640a6d4d---vijuraluzaduzigevijizo.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/80714212078.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7d55a203f---fudizo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083039282dd9---81965386376.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457fa634f0---59525757715.pdfIn PDF document text
    • http://soupworld.de/upload/file/xofagixaguloj.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/jisawanoju.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ba2b0b6b24f89c853aa7b97b8fee5abf/3303002797.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/caf523861296d0ebdffdeea9ccc6c6b1/bomafitajij.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/jixujikaruwodo.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/3066391603.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d9b0066---julofoju.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/73c2d97c2c2fa66f8b5ddd3495f0447d/70404192286.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210617185626529.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/joginulekiludeledagag.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af5116f11---dipovupaj.pdfIn PDF document text
    • http://wwstationery.com/files/file/tavosuxejawub.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda5fc1824---45628921056.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 17400 bytes
SHA-256: 50bb7d9c044684b4b34a2ef09fdf9fcc8302d2c9b62c5812d65a26b2f9e352f7
font_02_sfnt_off0001401d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401D 11788 bytes
SHA-256: a20322c86f7e96b28f58568aeceb884db7489874ae79ea6f34c5f49ccec12409

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