Malicious PDF — malware analysis report

Static analysis result for SHA-256 548d3d0f3c2b679d…

MALICIOUS

PDF

118.1 KB Created: 2021-06-30 04:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe84e9b404eda6d5d093af6cf16f9490 SHA-1: 0983f144180847656e4c754f62dd4f4dbcdbd859 SHA-256: 548d3d0f3c2b679da19f6236f03136a9b44f6612547ae47805cc610d3148a4f0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for distributing malware or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://happyhanool.com/ckupload/files/dofusotowakuxazaliwikas.pdf In PDF document text
    • http://hncastlecable.com/d/files/15626040556.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/mumagaxekena.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/sebotevesamevuxus.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083565abc1e4---wemelosisomufera.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc805b4b8c3---48737748722.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/80396935765.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/ravaxuzafitakitidememe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bgpofok4q3te6tkit39ajbp8k6/jibuvanavurago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fbccf0a1---litivez.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfa65e4c2---gidapik.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/90fe538453d3a00dbb260a51b7beeaf9/68299970559.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a091d786---gikaluwaxevuzadoxode.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/29257040199.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe818e0104---43725778339.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/podawogutodoz.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b80371609---27112708817.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/1943381530.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/umqjse71irlsfiq9n7073fv5vv/39899182446.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/58422993711.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607488c243f86---4717508369.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66e22e5fe---lutipulomiwodot.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/vinob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+count+carbon+atoms+in+a+chainPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18564 10636 bytes
SHA-256: 4300fd20903aa0cd21ffea37da055f454df71c9e1085ee09f66f05bcdff28f50
font_02_sfnt_off00019d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D8C 17184 bytes
SHA-256: 91eb4dd0ae97183604edca8ef504f3cfb08840d9d44a587d4d008d4d4a94e670

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