Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d9e7c30304f339…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 08:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e32adb594faecce004999f0b5ec7a8db SHA-1: 6281b079f98de15220b6338dd53772fc0203c4d3 SHA-256: b5d9e7c30304f339a84c52f4ad6bdd28c0f139c3f6f4d8d5032e935fd2864555
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=best+free+keyword+planner PDF link annotation
    • http://zajazd-broadway.pl/galeria/file/78694479736.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/57367117008.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/vimotedegugagizuse.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/burepe.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4c16a6c2fda8fd823d6f27be89178d35/30922331842.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/memerejajirizenipogo.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/8649638523.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/383109760.pdfIn PDF document text
    • http://kant21.com/userData/board/file/92589998608.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa4f75ffb---topusikazoxa.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xiwidexojebifaxu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140509ca090e---7918824705.pdfIn PDF document text
    • http://cocoal.com/uploads/file/41164492805.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/429693102.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132401616ed0---lerezawilupusimuzatepedo.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/95117741936.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/19552693629.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/nuxegoxoxonolekibamulu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/4267798421.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/veratuzozi.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/nerefafawolaribop.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/walatela.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/77303107762.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/bejogeki.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/21039350657.pdfIn PDF document text
    • 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_off0000b959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 14928 bytes
SHA-256: 2993ba79273542456de02007add520716bda9ba879a681f0dfa6f8ed4ead889a
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10744 bytes
SHA-256: bf90837ab67d54b5d0ea8cdf9ae4b62ce6df6788f038fedce0157d671bc0f391
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1