Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dab7548c883b036…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 08:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 653c56e4d303742037718ba07bf1d20d SHA-1: a89f1569f35a87c61c5c08fb55b260e12f70484c SHA-256: 7dab7548c883b036f294a7a4d0302bbbf66a7a9c3ae5b0bc60d2ff32e6ad583d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point to a common tactic of using link farms to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sevennews.com.br/ckfinder/userfiles/files/nekuzugobewa.pdf In PDF document text
    • http://soles2walk.cz/data/file/jadifavexuvepizawegibip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca9a3d6b1---77054362563.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9c40bdda32dfbcba03c677b92c0a65c2/99310771991.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/pimemelagagu.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/52241173703.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/zojofipadutawolij.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/xipuginibi.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/48216390719.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/bupejogisuvidixu.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/xuterevekuwe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f74e959063f32b9b3eb509bb4fedfe35/48220395048.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f307c6f0cc696fea51ab01922dd4d0a4/fanokasozijajalutof.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/neloloraralowenupatovo.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/72493189328.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6522dd93---6919310614.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/kezarakaxepes.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/kodogulojukivatopol.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b91ba3126a47f590b095d94308a362f2/72855477840.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/wazerutarogatob.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/lakovazuwobep.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/69503783982.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/62798487303.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d901cbac2944a0791c1d79fe7c24a1f5/mivadupopuxememupupefu.pdfIn PDF document text
    • https://aashianarealty.com/file/8819330266.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/nalinobekafajobewowekazim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hack+wifi+password+on+android+rootPDF 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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10604 bytes
SHA-256: 3baa86b2bd62b1e33be549d9ba100c82555677d791dcafc4345b8f2ced6e540b
font_02_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 17544 bytes
SHA-256: 7ea346d78efa5a99849391563067c7a601256669e0ef00e3abe7d2412952624f

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