Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c73fcc0894a49c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 20:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c30d4d8d79f0ac706023be7b7ebb534c SHA-1: 427e4e34039de5a5f08ea0cdf103a6bfe712a946 SHA-256: 03c73fcc0894a49c8a0337764a66c55802775a9b3c2650182b168d976f261755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest it is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://prosquash.by/data/95619900318.pdf In PDF document text
    • http://mynigaoe.com/upload/file/20210901033228.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/gimewekotajewagake.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/64086554482.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/tativalov.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/20689534311.pdfIn PDF document text
    • http://eichler-kammerer.de/pexewesunomujuzajijavifop.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/49233131099.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/xovunizumobasi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e85c8450908---88681128201.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/niwaveriv.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4aqo37kch2c3ov9i192ho5v8kg/14353993917.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/10941219733.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/kimuwuvaniwibi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/4726045422.pdfIn PDF document text
    • http://mobilenmr.com/files/files/86413039907.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pefipesenuleverilesu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/48k10d4pbeg8ahpruj46aauled/85522613951.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/46778768472.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/28033066215.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/labifeluwadajal.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ccd5b45244524fb7445471d4523bde0f/12942964869.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/nibibusoxi.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/logidowit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=data+visualization+pdfPDF 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_off0000bca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA7 10488 bytes
SHA-256: c96a8b7b69b60350fa08775629fe0d0755980ebde69275fe215ad0e872f8ffef
font_01_sfnt_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16976 bytes
SHA-256: 7751ea62f00a097077aa41247fbaab67d63dfe6fdfb5e86fba9733d3dd8acee6
font_02_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1