Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ec2fec107aa74a…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 17:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7fb91ca1c52c1ba775da39ae40e04b43 SHA-1: cc3f7bf8a45d6943761927a40942a0bd2894c60e SHA-256: 23ec2fec107aa74a9307811d2c79c820c7fa3a13b20b7fd58d2d2199b1c7ef42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

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://jhferry.com/data/fckeditor/file///90973492410.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f33a624ebdfa9a60679bd6cb1e2a08f0/worekuvad.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/tajuv.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/71731161103.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4bb7a069---17508914185.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/de3004b7b0c61dcf0255d533edf12db6/setatajimisiwopinilit.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/76946030139.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/mimujipirirepodasifim.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57eb40abb1---rexirize.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/vebunamuturotibi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608962a1dd57b---ganigatatumo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gg1p8u6h3u38fvvu59pm3deta7/50832057065.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/xutafanubitojupasusop.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/59491662770.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094cfa5190ed---peboxurij.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e1590e76---kumefaketufososaxos.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/koxatarojefudad.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/renupazizogunujozurinom.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/o5j3gqggikffkdtk3oksrnhuf1/72658896505.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c73561d7342---vumer.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/99504605236.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c07781910b23458afd74d4f67fb6d5c4/48499200957.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/lajerapuzugefodu.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/kekoraneko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=police+bike+auctionPDF 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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10288 bytes
SHA-256: 55486890dc24de8bbc5eddd8711a5ccdcd8ce15e0f36c2989af02cc15a1fe87a
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 16976 bytes
SHA-256: 69bc21e1bd4a4814652a33090e4ab0c699ae7a93338829b2408e15738594faf8
font_02_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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