Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5f4c4dabe4364b…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 20:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfe28ca145d541e84d2de9c04b624b02 SHA-1: 80588c9c0ef1d5c7425eca11d59a26ce8bfaa1ab SHA-256: bd5f4c4dabe4364b361814b0449b0194f22dc2625d2f5284d402afebac877095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The file's structure and the presence of multiple links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/uplcv?utm_term=dave+chappelle+emmy
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0ebb4f615f541f3c7dedff89327fda7d/19227864119.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a166ea82e2---64441401168.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a1fbcca786---94474308185.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/afcr0qd3hpnurjeti9bueute10/15158712049.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4676930e3---84531960538.pdf
    • https://x-software.cz/data/file/nuvip.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4876dbc05---sasojineponogoneliwexix.pdf
    • https://zlatartopalovic.rs//files/gekusi.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/jeguwevira.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b732b86bdd---81963096067.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c74442dc1fd---lajexit.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac682f3f0f0---69047236842.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc747751357---zenazako.pdf
    • http://forter.vn/hinhanh/file/13029446030.pdf
    • http://rajskiewakacje.pl/userfiles/file/jubumoxawi.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd583d529---zoxuvuzika.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16095feb8bc145---41039904535.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c6c7695c---76285564860.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/24d352fe929b543ed57151f77eb3c5fd/pibegametow.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 16792 bytes
font_01_sfnt_off000101f6.bin
9714b81978d21ad912adbd95332c638926f6d3486ff3cd337379cfe4e01664f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10140 bytes
font_02_sfnt_off000118a9.bin
b80c35a23000b447f054c67cee0e6259350a72a0d36474903668bdc0d4c0af88
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 18160 bytes