Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0617c197f15dbce…

MALICIOUS

PDF

70.7 KB Created: 2021-06-04 18:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05a3174eeb7794a6a6b4700d012c3c29 SHA-1: a3a89033b4e89460b8d8bf3744e1980bd67cb6a2 SHA-256: a0617c197f15dbcec08f80b25ef27b04be94e31adf9275ba1ae6bd5e0fc357a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=hidruro+de+aluminio+nomenclatura+iupac
    • http://aksaaydinlatma.com/img/editor/image/file/jotuf.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607997a912645---14731655553.pdf
    • http://arcomproltd.com/userfiles/file/55360981328.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e466fca584cfc554cbc8217839568a87/17118501700.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/53f01q6ci63u84t6sp39tib111/mukanabexu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6fd5918e5---18374599750.pdf
    • https://al-farh-iq.com/upload/userfiles/file/23982457137.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6jh6u6q755sacl9hrqcbit4555/44190354606.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e02bcb55---gujudexuwezipo.pdf
    • http://iziusb.com/userfiles//file/vevipepadamivufuxap.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/v70d7kqnkklrm85eaaebhgblea/sipulu.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/buwolimeborukitekovug.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022d168304---95854655417.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084c0e45a99a---wumevumanodokaz.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2c7a936b7---71628960235.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/251f888ff01ba02c60bf06ae2cf66293/84938834619.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/qd84kk195ac9rtb0rndv9j2ba1/vagubokabigopavegagerizab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96d.bin
9c3572eeb4b05775baad33a082d122df8b4c638873ac9b024f5f4ea8718f62ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 4884 bytes
font_01_sfnt_off0000d9e3.bin
334281d6d263d0e141b6e594d90129f12c7740b6a56c6cad58c368b7dbb2e495
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 10748 bytes
font_02_sfnt_off0000fd54.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 4324 bytes