Malicious PDF — malware analysis report

Static analysis result for SHA-256 213f5ab2b64a221b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 04:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b2db0e323114e0f5e16882fcf743cf1 SHA-1: b57fd4864b554cc27e0006991661418452e6fea9 SHA-256: 213f5ab2b64a221b87d88678ec0be2a5b52e2f0e5152be7fd5b2eeabd8334661
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://minerva-collection.net/files/files/weladifepafozur.pdf In PDF document text
    • http://tctrack.vn/images/newtech/files/3315692489.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fecc1ab9---1036114265.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905c4b2b9a---63041862585.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/377c94b85ec8628691d29e9c669393aa/binibutudu.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/tabeporuluvepuwazude.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/33966968363.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/92277301929.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/6487962449.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/pizuzinobew.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/bujosimutojanizukuval.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/11166001343.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab152a5bb0---bavusebugitijula.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/95691180096.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/18285391541.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/kenitavikipufip.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/97583120382.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/mosemajunabatekoxitufaj.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf50a7151---72636491920.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/24719822193.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/42551759694.pdfIn PDF document text
    • http://hadt.vn/upload/files/kififu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/869c14581bf48f218771a280b49a17af/42318737792.pdfIn PDF document text
    • http://tcihk.com/userfiles/rusokilikusufokedukefum.pdfIn PDF document text
    • https://oasis-travel.ro/files/tijonizoxutifiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+hero+academia+hero+rising+streamPDF 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_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 10876 bytes
SHA-256: 91c346622f0001d044e9f28f289c698b8afcc3e52b5974fcc2426845f6b1ca8b
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 18644 bytes
SHA-256: 3eda43df1ce6b756d2903db4f824a48a2ca46f94c2d45bccaee21d99e9686188
font_02_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1