Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faf2e80fd9f94c1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-18 19:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33156adc230d9051f7f93004c720ccbd SHA-1: 4fc71bdd60adb2cd541c219a681009b6ab2a27af SHA-256: 9faf2e80fd9f94c110e58ab2e687bd3d6d7aff244d95f30601eb58525d6f123a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243df672f8---11471133186.pdf In PDF document text
    • http://global-leasing-management.com/uf/file/nopalilo.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/dawiv.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tizokolojasaja.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609274205deac---zopukiwo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///42664328098.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/29074390597.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/tukabevoxukapijurojepum.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3d667cc3---10918981903.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7576dc40---pedupidifiba.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/25879013732.pdfIn PDF document text
    • https://oversaslogistica.it/file/nakowulajitasene.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f490b7c7e---jivovazapexu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/njqija1jtq19lnamic0st540cs/73660767866.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/negano.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/acad3d3r9naojpamkecrl2dpg7/89547273316.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c235012220cdabd84caa71570b88fa18/5598124915.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kisur.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wufisaxoj.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07b690ec4---31335640028.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0765670e---kiromerovi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5k26ole3rgkui7vs3k07ebvh3j/69845170873.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82259989911.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/72166310668.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/btfhtm50mhtko5mgupisnnna7i/9206657468.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210714_A021FFE8537D6BF6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=project+management+the+managerial+process+5th+edition+solution+manual+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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 11432 bytes
SHA-256: c980ab247a6444b822d1d017d29f265d67d358954cdcd1976f8730451910e220
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 16928 bytes
SHA-256: ba43a0c76aef14ee4c7febeedccee9860a43669a13a9a4a66e9cd1d57ff8a28a

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