Malicious PDF — malware analysis report

Static analysis result for SHA-256 c745ef284d17abd3…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 07:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2da2d865462173d9c101f2971699d1a1 SHA-1: 7e1fe3d63c2e6fdaa57691f0a7c4980f77bc179b SHA-256: c745ef284d17abd3d73ed44ee9144d5747de45ae946d3c9363838fc2fb673134
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript, though not explicitly detailed, further supports the potential for malicious actions like payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=toefl+vocabulary+list+pdf+2020 PDF link annotation
    • http://openendrep.com/userfiles/files/66834856990.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/fufijebowu.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/43539548796.pdfIn PDF document text
    • https://strechybenesov.cz/content/59057600353.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/tuwanazi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/2392762208.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe706930---zafolimedewevurisoxu.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/17150906741.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/27098063961.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/tanuno.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/73141347051.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a182e971c---6353590972.pdfIn PDF document text
    • http://yanartextil.com/firma/files/doguxubemi.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/jiferavisuxijijuga.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/88949122364.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/kusizawu.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/bowutobetadikenevebamiw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161442bafaa3da---ludidosowixenaxuxugijema.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/toxunepitobogepexesojo.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/jifogimokuv.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/76308629303.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/suvitulefiwoxafo.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/32003091560.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/11167471545.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/912225acd33c9feeb4fa80c11e258403/98901379518.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_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 11132 bytes
SHA-256: 9da61c341b2d9255dcb970cbd7a86ccbdea14dcba6d7719a310bfea7511d60bc
font_01_sfnt_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 14292 bytes
SHA-256: e71cbce75b35a468063a51682699e54bd4ef64b12eef0e4e7418d29e189de3ed
font_02_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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