Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c19526d79ffb10…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 05:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69bbc4aa220d05ac4c44aaf48d08ed66 SHA-1: 2d44a96cd99b8bd672d8c91f55f6df7bcd8b110c SHA-256: 50c19526d79ffb10a314d75d4def31d1d6b821bdce2cdb891eefe81654ffee6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://lateonsettay-sachs.org/userfiles/file/domirevomaforopaje.pdf
    • http://aire-limpio.com/img/editor/file/tugevubafilud.pdf
    • http://hy-concrete.ru/d/files/niponosikezigusije.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7daaf413---50415255430.pdf
    • https://m-isc.com/userfiles/file/97309854762.pdf
    • https://indobaliart.com/sitefiles/file/13887256865.pdf
    • http://aire-limpio.com/img/editor/file/17411837838.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce08cb224d---pumunamofejigugotavab.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27dc44e96d---vopivirobirulugoxovofe.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/411a4521568f15a2889cc725157200d6/68196998431.pdf
    • http://www.allatpatikapecs.hu/images/file/96289181358.pdf
    • https://alperbehang.nl/userfiles/file/83094938794.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/asec54t8g9gvm98to0auudbugd/47996501537.pdf
    • http://agataklimowska.pl/userfiles/file/85346728446.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/140138c671cb0414feb3b8d5d3257e3d/198694975.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6c050bc10c15a1f21c38a634ca8b7ca5/54024318907.pdf
    • https://familienbilstrup.dk/userfiles/file/28362792235.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o47psnai55abngullcjbicke42/66022726376.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d828cfdf567c20f3fbe47fbb26f57372/64415323212.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/78091367544.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b976bcc8d---bebagoja.pdf
    • http://huile-de-nigelle.info/userfiles/file/webepufetekikova.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ankduuqg32bh5cshc5qlfrv9k/jonesedorarorovaxapiz.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608159fef201c---30836413209.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/11a3ed85266b8de2707d5c4e67f9283b/sojagatawalizomisimemis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=japan+climate+zone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec32.bin
e0c9fdd4c7b9a31b01afce3167dfcf0ff5db723fdae4350b0a824fd30bf27882
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 10320 bytes
font_01_sfnt_off00010378.bin
0f3d329929332ddc50ec13985fbdf93d9d4ff949550b2e5ee699cd57c864692c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 17472 bytes
font_02_sfnt_off00013024.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
font_03_sfnt_off00014831.bin
119551f9c92a443a42767d310ce58599cced077ae9e6a9f59b09b71c4fb8685f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14831 8180 bytes