Malicious PDF — malware analysis report

Static analysis result for SHA-256 845a462adfee1b12…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 23:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64b99c4c29bc8e2cb961c3a8f2ebc290 SHA-1: 253828b3d74f926b090656f04cd02d341adc3e29 SHA-256: 845a462adfee1b120c9a5f7b252a1bb8c730b79dbd9bee4d9938d12fd2eb5a53
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, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/09637d8d40a70a8c54658db7959b2503/40798485980.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kc6c5qohaene7stqo44s9g6rlc/loguvara.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/mhrq2aounrfe1m08ea9j7rs0d1/pazuwiladoluxinigudaxi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082611acca2c---panupipivimoro.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xupowosonebix.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/6788305082.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096751fe18b0---pasawurerevipoxexeju.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/85985055938.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62df599e62---38750152387.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/62129978100.pdfIn PDF document text
    • http://bociany.sk/media/file/gibodifowaradiwomupezek.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/nenuxidare.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a9b0d7429b684adce151e939762c4c25/43764512112.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccac07f68---92992584512.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae33fb6d73---duzobofudaliziwebus.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/kogukosorelabeluwejobiteb.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e9b3ab23bbead3082e62eee143edc094/fopuzidevate.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d805bab9---rusufozofa.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/zekalamemamar.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856a2df0b17---3012022807.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/xelamuginunememazerafu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5390ba87---59820171504.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tbb5bjj7v27gn1e1hnpgl3enkc/pivitipexenevu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/b924sm2tlc0h6lc4h10gl7um8h/paxarasozape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=reinstall+mac+os+without+losing+dataPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16080 bytes
SHA-256: d9b8130aa6f9633ab3de79ff31e2004108ab7689d1c7a99745aef320e0a208db
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 18776 bytes
SHA-256: 5cf1aa75c8948487fb147cf16c55b0312f8577cc00e84def196252114832cbb9
font_02_sfnt_off000137ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE1 10948 bytes
SHA-256: 124a700f18e167bf61d3ae0bbc6d7b4a6f40cc55d07ce3dda9e855e0d10a39d4

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