Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa43a88b3d8f8885…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 22:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06cd865476469be43daddcd9d3f635ef SHA-1: 58eec8429895e335c6aafb211e100a49b3e47d57 SHA-256: fa43a88b3d8f8885d7b9f62d59c1408684d2a1da0d8ba800644fd4f586a3e331
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The file's structure and the nature of the URLs indicate a likely spearphishing attachment used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nickelsgrafikdesign.de/ckfinder/userfiles/files/rukuf.pdf In PDF document text
    • https://nadrozmerne-sklo.cz/uploads/81615804495.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nobexasosuvipoxufapibimev.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/k0m75q93kjh55ds9pg7s87lph7/nitevefuvetinu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612bddbbd9d09---wirofanofuropu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b18620485---61913904246.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a348b035ffd---67774574913.pdfIn PDF document text
    • https://energooptima.hu/upload/File/51770642449.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079967d74156---gebipezolagutizux.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080819059627---lamebotuxita.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ce67f93d738e3fc9b6c6a52c4364a24d/10045413354.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/vubagamuworeguledoteku.pdfIn PDF document text
    • https://artbynela.com/uploads/file/mobojajudulosakopi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5fda0664d---gusutinuvopelenomonosagom.pdfIn PDF document text
    • http://uchid.com/uploads/file/46930042163.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/37832103566.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/22151001757.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210717_FA78CCC9EED3C7C4.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16100d79c0ade0---86863849180.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/91f3179d5dac0c2dcda256a90a0ddb9c/rasudofetujo.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/gutirir.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/23087917988.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/dogalalipafe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9638b9df---kefonilovoxijetovuwixosa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b11011c658bc1b6a241286d9536e712a/wusudim.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc816da3f2---taluzawadamajafojetuzusok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=child+education+allowance+form+for+central+govt+employees+2017-18+pdfPDF 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_off0000c554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 12048 bytes
SHA-256: e8bc9e01ebb20a18bccdcac6789889f31d1197f0b3e3c4db834f6b5fd8db7f02
font_02_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 20040 bytes
SHA-256: 3e27601604dc0d8ec563c4e15a0bc6023bb945b9ecdd878927fa92be06664caf

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