Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50f00f0d5983043…

MALICIOUS

PDF

87.9 KB Created: 2021-07-21 10:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f345ede4b7a495e0fe0bc88c4e9a9f7 SHA-1: 744780384f285ba70e2a01422fac2b05f8813814 SHA-256: b50f00f0d5983043f974abf058e804c43ebb3d6bdd8f90aed632e1eaf43fce2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The file's structure as a link farm is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://e-photo.lv/ckfinder/userfiles/files/serazutavinolizuwox.pdf In PDF document text
    • http://dailitara.lt/bites/uploads/file/gamukowoxagotami.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/lofafomiwasitemaneri.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba52282aba5---rifabosob.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/21971933729.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/pameporavedolivanaza.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53c168b89---xepekoziki.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/22357108414.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/q95i38sufdhls1a5mm8f3kstv0/17847735920.pdfIn PDF document text
    • https://akemi.ro/hirek/file/lirademadeg.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/suwugas.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202152461357.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/410897bbdd9b5fb365e67cec7973a691/lenabofonovigi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/jafukuzukoxixabivivi.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/razevipun.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/9211224276.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/botoxijogox.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/21414591487.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b15441767b7---199851546.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/ropokefafujid.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f97cc43fcc5262673f6e370c69668c5e/zifabonimamufizefaba.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ca08664f3ae394d20a3e6a9dbe091aa2/16354451074.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/depuja.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/10650760777.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/48003147047.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/80vtsudnpe1kok92f3l2fbd266/34040036544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=actual+guns+for+minecraftPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013500.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13500 18220 bytes
SHA-256: 8630f7af0781788c5347b39312d428cb49de0b61a006b4cbabc29ec3ae2d27d7
font_00_sfnt_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 17292 bytes
SHA-256: a7ff0bddb0751bf313a3f1b3c673b34c37df60dda9601d25d48240cea9825a81
font_01_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 10760 bytes
SHA-256: a62cea44f489c9849d5ff23eabb1bd703d3803de631c6c4f0b64821dc1046310

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