Malicious PDF — malware analysis report

Static analysis result for SHA-256 d552cc5abb2aaf62…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 16:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a73afb382a4a610b1f037f49478159a0 SHA-1: f969553f24959623d265ed9ecb8c5161a5191c68 SHA-256: d552cc5abb2aaf62ba586e47657254c26b4894721294ae58327e6fab97da2cef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs that point to link farms hosted on potentially compromised or disposable domains. The primary function appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://linkingpeople.info/userfiles/file/peregukasimosoxetipeb.pdf In PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/63905504979.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c71b17506---veteloget.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/nazawexigajosuzutogunefe.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/wifudowalipoguke.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/7340214277.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/fifukag.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/9393961204.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/96622880372.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pr8lkm9qj1voe3p5jeegkk9cpu/42074836010.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d0cab544---55295290771.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef1f9deb3c72593710388cb341db2398/walogebex.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/kikidetubimuk.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/kifidibaj.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/pemewekater.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613035c38cd3a---65159754554.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/dolil.pdfIn PDF document text
    • http://hoachattn.com/image/files/56850246074.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/26347919412.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/53312687728.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/jabakomoxebevikolo.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/65812493731.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/44889659185.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/gadijogorilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+100+season+7+episode+5+123moviesPDF 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_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 17576 bytes
SHA-256: 99de8d2ff8fd0f716222f46ac1d2d3c6cbd4d26c972b4e06f3714a908f24b252
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 11092 bytes
SHA-256: 729142d8ac6f614aad7d00fafe290be2191e83a6b83b211edfd8b1cee09bfb1e
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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