Malicious PDF — malware analysis report

Static analysis result for SHA-256 8983ca668da6ffec…

MALICIOUS

PDF

83.3 KB Created: 2021-06-26 00:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 910c9ec6c2b3aad2a6f33fa4c41cc1ba SHA-1: 027556b2cbbfcbe83b418c376ee354a025c439c9 SHA-256: 8983ca668da6ffec75d061847fd3a8c7d58e6bbf9a971742c1ea0d6823e438a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://thedreaminitiative.org/Content/Admin/uploads/files/wawurez.pdf
    • http://www.herbertvanderbrugghen.nl/draft/56432499121.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b890f54ca97---jisupoxigoz.pdf
    • http://quaint-house.com/74774437540.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5442ca16e---nexeribezalojikosik.pdf
    • https://sce.tw/uploads/files/60c70ccc5bce5.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba411b06190---43637292707.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9fa953bbf91a4291655a76c826f4be30/30976995147.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b14caee1a82---watirokekukemepudagovof.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972f36b424---luzejofamejum.pdf
    • http://lg-palette.com/upload/files/63551001546.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a70ead12ace---nunabemalajijuvuwabab.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f2e00b4b---rijajosapekasumo.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d48855f52408bfd3a049f5e7d0b46977/fejebak.pdf
    • http://dlmberatung.ch/userfiles/files/34828853942.pdf
    • http://soflocops.com/clients/67403/File/72422512873.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f3830ec0.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/b4ajmrlpb7o2k4qg8rq4bd0kj2/sododiguwavujatak.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb3f5a5d5---vuwulokolobux.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8e6d2de48a8b3e581f352332434e784e/zaterifevuneri.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d4f9385bd7a5c8b11ddaa5351d2ccf35/nigamowixi.pdf
    • http://tivatijapan.com/uploads/userfiles/file/12825632703.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tnoaa3qvi7catsvij245r2kg8d/sunufenuwuvavofizuxogotof.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fi478nv073kptd9qbj2cr5gok0/96715818268.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8a323d7ef21a9fd372968cdc38a612d6/puwotobajawotok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=polyester+fabric+hs+code
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bf.bin
c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16084 bytes
font_01_sfnt_off0000ddf0.bin
38e49f6b5196ccf5d3cd1f8d974eb9bf5404525c1d8d7000da7fd00eb67209f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 18656 bytes
font_02_sfnt_off00010e72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes
font_03_sfnt_off00012689.bin
ca75150bc13f116da175b27537130e53891e600197dc9563b7ab097793ff58ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 10724 bytes

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