Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b77a249207fc8a0…

MALICIOUS

PDF

74.2 KB Created: 2021-06-13 13:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cc8425fef9745989845207742e483d0e SHA-1: fa5ae3ba3439c3b6fab0c8fae5ddf3501c5aec55 SHA-256: 1b77a249207fc8a0f155ed4221cb1013bec18398b373aa6eac30259939f2e810
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely to distribute malware or phish for credentials. The embedded content, though heavily obfuscated, suggests a lure related to 'Asphalt xtreme offline mod apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7544

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=asphalt+xtreme+offline+mod+apk PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a1625b90d3c---givinomufexikunuwobupake.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75f96713d---dinuzorejoduperejuger.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/xatazogutikemusakewa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801833896a5---litodavivamobovude.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ns1n7fjgjumn7c0n3hi6826tl4/12604520754.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c1aaa3d8---10407564803.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde5eba2a7---depubixexuka.pdfIn PDF document text
    • https://avenue102.com/uploads/file/bunamalekatujugulap.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fd7n8kdmrp9bevb9nodkfunrpi/joralimamote.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/wereme.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/65830567890.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hc4k7g83gi88v9p2juh0vaeegc/53691522961.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/turetutupibopaxiwoxuremak.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/952fd6cf7fedea1660476b7976b8a3d8/pilatugomideperavunezazol.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1603d56b96---46277496493.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/u0cu338e4ieros5oe0u140s7p7/954902869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 5400 bytes
SHA-256: 3f96a1c3c0b61b96b535e2f306d574ebc48baa6f222dc22a52f8a4ff367315cd
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 18984 bytes
SHA-256: 74a631e3b03856bd1141608d0c9cc39d318b6c70ec95c163d658e0b78e2734b5

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