Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbca560856086a8b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 05:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6447b0b42161257b2593066e954aaf8 SHA-1: 68f46efd9dec0b2c34fc5e57da95f77d25079627 SHA-256: bbca560856086a8b9e36aa11af9f9c10601c500ea3a5674117da203db26a8fc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or redirect to malicious payloads. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sotel-perm.ru/site/file/24559389366.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/46664285085.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df48a85954---81982849055.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/18004061601.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d0a182ebcfc422ad405cfcdda4382263/84186326713.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a44ddb1b29---97856263191.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d87348ed---kobupajufelofi.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/uhac96hgcuvlk1vhcjjc4i37nt/60067791563.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608800468a1c5---sevijop.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/pibedaledezunewalalu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d16b4a2e0---jipuzugibu.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/vuguliwiwul.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/65898626150.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/51234232033.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/wugudo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b433a72c6---bifanuziluzutasela.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7efd022c71---16073756070.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/435683fa8d2a1a02f18bcab928677a2b/34027864014.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8a62c728---rolifuzubibijexebigusovid.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/90268996581.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074332b8f711---wusixemujirupixanojoke.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/80311e189b4f497d2efe43458231c1bd/pirefaxaguwixepakefiri.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/59632360106.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d269ea31---50562916251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nice+songs+to+play+on+pianoPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 15780 bytes
SHA-256: 57a94324a5752d5e81720240b63fe29c350637685ece15f6dcc746399d3da89a
font_02_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10540 bytes
SHA-256: c21540166180ee6e27b28d48c3c771841b7e4aaba13db23decc386436c768668

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