Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c1ae551d802dec…

MALICIOUS

PDF

86.4 KB Created: 2021-07-12 22:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75bad6f17101f3b0244af65ae8979744 SHA-1: 0354360587da03c254c378398458f7e84c558ae1 SHA-256: 53c1ae551d802dec5edf1c73fc58976f630aac4fd3b07886ced08544a445f207
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45e2d4ef2---fumapidumefanavakoturoso.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ea2ac50ccbb314af8cd7b6f828e279e6/repulaxikije.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ddb456c4d87aa65813616cf4ac443466/kofoketew.pdf
    • http://shinex-auto.com/userfiles/file/9758179839.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f214f67b---68973117600.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/36216955127.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c6i7uo9i1krk7b4vaf3t7ev885/91662705261.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b50562717---64275775050.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6c8524548b31444fcd6a124afb28befb/rugug.pdf
    • http://np-laser.com/upload_fck/file/2021-6-18/20210618041715667253.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8631c7a53736d2d4ebad3c543205a655/27841203014.pdf
    • http://icltindia.in/userfiles/file/bedosanumaxigani.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/18affe417430778b5a6a2cdacd311945/temebukateligopesor.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325aef34b5---57744535612.pdf
    • https://mb-classic-service.de/userfiles/file/8708159697.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5e1ae434---sixefusum.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0e62eb70---vobodudokoroxiduxobip.pdf
    • http://lateonsettay-sachs.org/userfiles/file/jibup.pdf
    • http://isvpro.com/custom/files/wajosotajodixed.pdf
    • https://himalayanthailand.com/image/upload/File/75758290435.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fb37b741---jomajomisegamugemu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what%27s+a+good+answer+for+what%27s+your+weakness
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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_off0000edf5.bin
8c89868b3a7e283710cae54530b9f99cf9f0e3a98365d8880f7fca9e13ab8eb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 17156 bytes
font_01_sfnt_off00011a9e.bin
1b33c062e1c5a0e84c45aa1a3805f04758ea5fc2e870332dfab33bc8d6bb49c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 10912 bytes
font_02_sfnt_off000133cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CD 16792 bytes