Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16dbf211b962623…

MALICIOUS

PDF

72.6 KB Created: 2021-09-14 09:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4cc1d879cba0964c16d6e64ee8a8fb1 SHA-1: e9b104f6acc2823dd1155ba533196fda815924da SHA-256: d16dbf211b962623837ac12f644ecc00b8d429333faf393b6573aa102b274ac9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links likely serve to lure users to phishing pages or download further malicious content.

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://cachnhietwin.com/luutru/files/zapino.pdf In PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/fovofokapojotevepasi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327be5b5938---kofoferuzamodiburexesad.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/88185895516.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce4a1bf9a---kewofuwesa.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/luwefegegovu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a78760f1f438e4cf87f76e36d4238edf/pamibuzuxoxegoriziga.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lexibadesezena.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210911113107.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/62472292664.pdfIn PDF document text
    • http://ustunongel.com/image/files/76953796734.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/fepebawobabojev.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e171b18db3---63747151297.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/59710752655.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/43533273599.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9d2d714e---nizezazopo.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/19066431839.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/66904235877.pdfIn PDF document text
    • http://friulanapanini.com/images/file/girufilaxopataw.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/82538989480.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/woxakifoxelajoz.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/sibelevokif.pdfIn PDF document text
    • https://activepymes.com/pub/file/13951006140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+movies+2019+full+moviesPDF 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
stream_003_off0000b5b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB5B6 17632 bytes
SHA-256: 1b2708be0d34e70b4d555d8f3c1c5e61b3f57b12d005fffddfb6fc89830de7e3
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10616 bytes
SHA-256: 26579aa133685512bc359e1919b8f04ee323630eeed26255e292588237eca2f8

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