Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df2cf945d24185a…

MALICIOUS

PDF

188.0 KB Created: 2021-06-27 14:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2f63a507875cb981b789073d89066302 SHA-1: 876c9924ba3b59481734931ff8ce7b5633f04b93 SHA-256: 7df2cf945d24185a1f60f278bb159488272cd694bc384431eb94608de8217d87
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 a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to lead users to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

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://www.euro-fly.eu/userfiles/files/nilufiduwexuvapadufisig.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6337104ca1a8234d56e49d1e942ad7b8/50948579375.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/59015824534.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086805210f68---tuwuduwivebolube.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3e0d0b5fa775dd63e125914d8f357a09/zixiwozebuzuvigi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/08c5sok7agog8q7ccn3s7q2mla/merasegaxuzoxis.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ouuofh7rp4nsaa79fk1tdp4tn0/16830436185.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/degozagegobelodasi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/milazuzifisevitixeduxifo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7cd4e86fa---68541356093.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aae3058ed---vizujomadibakopipol.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210625224344.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ehfsmjbmp16jhn71p4e87mm0m1/79554035368.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b126ddc30c9adbc2c31420895b2286e4/33872021275.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/ninilenaze.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b04bf4e9d7d6c6f07cc3933cd7cf4020/molegajokap.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a0c885c7b4b4ef5318b73e33c5384ab5/43568449053.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zolofigujamisufirisule.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce637e09672---47814739855.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd97736f94---fugubenalaralimapi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608423de4cde7---99303987440.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3d995379510d53fca4b8aadc8d776d18/54933150645.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3dc07c5cd8183ba9b1fc5b8e24da8bbc/2370931276.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5633b542bc321e746475c88c2a3eff97/23534610825.pdfIn PDF document text
    • https://anfauglir.com/images/file/68749584132.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/noviwutuvojov.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee6b6b332---vudufoledoxizodesul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=an+elementary+school+classroom+in+a+slum+questions+and+answersPDF 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_off00028283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28283 11064 bytes
SHA-256: 5d819616281a2f95810e5a915a19814b90b9cb47d0aba747a7e26eddd56934a0
font_01_sfnt_off00029bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29BFD 17512 bytes
SHA-256: a07ec18293476c3b6da7a6631fa472e73450bc72e3ce2546f11a7137066a6204
font_02_sfnt_off0002c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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