Malicious PDF — malware analysis report

Static analysis result for SHA-256 163e24d9ea7b5c42…

MALICIOUS

PDF

70.7 KB Created: 2021-07-06 02:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28ae2825f22e0b901901a0722e72fcad SHA-1: 8e33eee52699f7d87a5a72709462c7de6b5d30e3 SHA-256: 163e24d9ea7b5c424678472e45a4b0e246d64f7715798ffde2d15dce04b72c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or 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. The presence of multiple compromised or disposable domains used for hosting PDF files points towards a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://abpaluso.com/upload/file/jufawofevupetab.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ae4ad5422---20849575710.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82dacf3626---544258529.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tr2btskfume1m1hnf4t23613e1/fuzesiwijoxumitejalu.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cae89cc6d2---wasinozedilogixugobutijos.pdf
    • https://aslimitada.com/userfiles/file/57609857842.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757814454df---32896347142.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/625b9ac3bbf7f0f12eb74db678146976/xoleparezanem.pdf
    • http://afgventuregroup.com/cfiles/file/13652220222.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f5f4352ce---27969006198.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e42d6aeb6---76919896225.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608438ac9ca16---gusikuruwogagefodevavafi.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28cba6b22---malil.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l7dc18aslvsrgn8n0es7d3kuvs/12380550012.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099b821df876---43423396335.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215191144358761.pdf
    • http://acmemask.com/upfiles/editor/files/pifuzad.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f737aea171---xepigodotevikujira.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d2e5875157eff3952b1dd8442d71062a/jinen.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8892552a---kovajopu.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2a72619d1679ebadfe6278dae120bb26/xobetevilifufetumenofewit.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/65279826019.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=unboxing+hot+toys
    • 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_off0000b60e.bin
5c6330ef4644433815927a1052d2bae21f6df60f30e4cd4bf98c5b18bee99080
pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 15796 bytes
font_01_sfnt_off0000dea7.bin
bbd960abd8daad28e86c5b019e4c7e2cb6c215c0a163c443f098892e27b63a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 10308 bytes
font_02_sfnt_off0000f5d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 16792 bytes