Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd87f1d46762b820…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 14:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa6da59e9da7c8f5519c0d4136bfa019 SHA-1: 12599ee90dd059bfac7f66db7be0c512d3c0ee6a SHA-256: cd87f1d46762b8208c53c0e5abcce77cbc0a38d8a0289acc795e29668022b1da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely serving as a lure to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=download+crash+bandicoot+the+wrath+of+cortex PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/870d9e6365923c83c870024961225642/5255170252.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/zijev.pdfIn PDF document text
    • http://premo.at/userfiles/file/zekapeg.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7c2ddf902cc0cb83958f07daf051041e/1749698186.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/99889977469.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/16288749503.pdfIn PDF document text
    • https://eniedu.com/data/file/20210905195145.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/josanuri.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ad1df08f---28351736412.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e154f7ee8a---45452985731.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/93134200878.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f840663dc---lufopasadedusaduwejim.pdfIn PDF document text
    • http://guchen.ru/d/files/bewefexizufugiti.pdfIn PDF document text
    • https://olterus.net/contents/files/26711852108.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/lativa.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/tikesexef.pdfIn PDF document text
    • http://ktcz.eu/files/files/12824088384.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/73635995829.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/7948371349.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2ilkhj450kac7edct4272sss75/fimukebakoxigufavoliv.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330bd0062fe---33989452029.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/223151edc68a8df1b72e677ed1f55057/tikugonajomidutex.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210914/file/rimezuvumetadotilik.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_off0000c494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 10900 bytes
SHA-256: 992c1f1b9dcd3905ad3b66938cfd408c3cf22b463e1de101217b583fee1eb368
font_01_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 17224 bytes
SHA-256: f81d9b63cec0a9eb496c05cfcb60a60a54e57e285fbbeb80983026137b2615d5
font_02_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1