Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7a9ec154c29143…

MALICIOUS

PDF

95.2 KB Created: 2021-09-09 13:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 218529fd231c23c055d10502ab862d76 SHA-1: a19bebd7d208cac895985b1b2f5e216ab79e4436 SHA-256: 6d7a9ec154c29143f4cd7a412dcab8a061599853dd23aa97c4772e7aff325a73
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and UTM parameters suggests an attempt to manipulate search engine results or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tccsrl.org/userfiles/files/23816876291.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132182cdedb6---wixazevadijabajanub.pdf
    • https://ww150002.linebot.net/upfile/files/20210903033037.pdf
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/81455420323.pdf
    • https://maffart-guy.com/userfiles/file/sagerowaga.pdf
    • http://telesson.net/_UploadFile/Images/file/togebenotumik.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1887a7b3---fezejowuferofajezi.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/106f50f3898c3abc0be51367ab1a158a/99929557485.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613284e464464---21113866899.pdf
    • https://cambodiadriverservice.com/userfiles/file/fifideberexujexe.pdf
    • https://fereshtegan.net/basefile/fereshtegannet/files/8849013444.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/22532197898.pdf
    • http://christ-china.com/filespath/files/20210908065642.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ceece9430908686e74eb5d56c2bfd765/givinofagaxeserijuzulexem.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/turutazinixotawu.pdf
    • https://maintogelonline.bet/contents/files/35045293966.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161386a778d883---89111012190.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/liludizu.pdf
    • http://mabo-meccanica.eu/userfiles/files/52904864314.pdf
    • http://sbkf.org/files/files/falutaj.pdf
    • http://techscreening.com/userfiles/files/83233617336.pdf
    • http://fatimaartwork.com/userfiles/file/47478583946.pdf
    • http://dailycan.com/userfiles/files/63322903301.pdf
    • http://concilianavarra.com/userfiles/files/10069483498.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+vijay+tv+shows+online+free+streaming
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 16792 bytes
font_01_sfnt_off000125a1.bin
7dbd9c75f7e2e73a545654fc0f5ebc7ef19a310c2a1a9d0cbc86832a4615b198
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 11172 bytes
font_02_sfnt_off00013fa1.bin
5989ffb3301084860e60f4396a68c8dc56cb1958c18fe99321bef2fe0029c1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 18160 bytes