Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0c9e0c50835d76…

MALICIOUS

PDF

89.3 KB Created: 2021-07-22 02:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1d630ec929e6da831f47727e12c75525 SHA-1: 60a463109430f123d4bf7ac46468f6e76db1ed98 SHA-256: ac0c9e0c50835d7625f46f334d4f442545bd358f2e02b3788b4e7784221ac13c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristics clearly show the intent to redirect users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8e1eca02---38369275419.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609633f127f39---liruwigejedemifewanu.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/13047581021.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4fd789302a99591ec8d68415aa78dd3d/sumexirolalomubatub.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/vitekinajibebo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d933be58ad---xofuvabosuvebunolifenubi.pdfIn PDF document text
    • http://safarang.com/basefile/files/wofinafafepumovugutar.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/disediva.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xalaxi.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/87483445983.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0457d6329---58053199724.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854495dc704---legan.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/vajomufobolav.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/87639018302.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9432d706---kopiviwobaliwufadami.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/59828591133.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/7080183241.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j7ml3649sqp75uqve6ircq4sf6/vomub.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8ec9114f---fanotosorapuzajevurunavof.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a497fa1e---62775202632.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/nerezarurogusajotoxepozoz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a9a1fce9a4c7b24b409465af336648a/47135172976.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9e4ffff69f4fe8fcdd81e1f33b6a49cd/fepobugasikideligobim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=suspicious+partner+tagalog+dubbed+full+episodePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off00013b42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B42 16836 bytes
SHA-256: 200686e5cae5a04270f0e543ac38f0a4209c9c90ee8b5ee67339f7c07bdbcddb
font_00_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 2016 bytes
SHA-256: 0e5ec2bea13effd77cb0b6370a1617dd5b2404068b08afef6d6d521e1ecea091
font_01_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 11108 bytes
SHA-256: 8c477e9048fc20dc14390e2608de901f4c246e119ce6d0e33742deb2c2e3e243
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 17052 bytes
SHA-256: 1c9847f5e26c42a91d6234adc38fc582aee702c7594dd35a4e7aabbe9ed007e4
font_03_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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