Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0da938f7f8e46e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 15:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c8c2fcf5208c2fcfd3d74c07d67bc69 SHA-1: 31166d5e7c32a11a1f86be07395dcd7fd909a31e SHA-256: ac0da938f7f8e46e293fca6a0e2c574e5401c4a9cc6cfb463c5de70ebf053c63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=looney+tunes+wallpaper+for+android PDF link annotation
    • https://ijfbacknumber.com/editor_up/gujirisojageraramegewipu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/72208346690.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902054954.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/98052744400.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/19335480460.pdfIn PDF document text
    • http://bienbao.org/uploads/files/mumatoreburudixezagow.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sizoxavofuwulorovoxo.pdfIn PDF document text
    • http://ave-france.com/pics/files/29216691135.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132547a21bf5---demovupibufenusu.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/30554126433.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pagotijiwojajepulapo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xabinomonorum.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613de648b2cb7---nanonajadevosek.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/wedefupozofigunixememeja.pdfIn PDF document text
    • http://net-work.cz/data/file/zipopaxunoxumogiwuge.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/71964413355.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/devojokejizoki.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/mazidajugaxajamososiwo.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/23288753467.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/lifafimujomuwalivesixano.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef1d9960f---70965842045.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091104485070554.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/712563692.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/27017836296.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/lubenotajitalutibis.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/1830819758.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_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 17848 bytes
SHA-256: d1dc4e11555c0b31213a7dc7646db9381b416ed67fe5b6849eabbc9c79e4b4ca
font_02_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10748 bytes
SHA-256: 52c72d371424a98d443a4ea9871edd11085b5a07f7f9b2aeb9a3fcecdf7cfdc7

Open this report in the interactive analyzer, or submit your own file for analysis.