Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca56b916805f6aa…

MALICIOUS

PDF

101.3 KB Created: 2021-09-01 15:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd564855ceb65950e6a4f615d6c8ad0a SHA-1: 2a4eea791e6f61fe55ed1023ec65133f8e4e5c17 SHA-256: 5ca56b916805f6aae25692a24538244743cb9808ee9cafccbdd678be21666a7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://jungleflightchiangmai.com/Uploads/files/gowuxudibobotisibiv.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c0cbdc07---72266647879.pdfIn PDF document text
    • http://wenxuezj.com/images/File/58189898641.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/totaxepilixan.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/20538910986.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/51918579093.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/rasefumajebegibofo.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/ma1j0fk8b6qfok0vljmml7pmia/82426681915.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xidimilafuxesiroraboniw.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/duxav.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1333f87ffc6e5e948bc41fbceed45f33/84329202775.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/90352818200.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/82120725061.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/haedj0klrpa0joflg8hf168786/sasatupolazegepakoradakiw.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/40701838574.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/73370057591.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/genukujaxi.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/67093177399.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf310c5e463---dorisufuwajejeloxomokatok.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/sofisexinumotewemaguni.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078625e883ab---19731657736.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/25282769264.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/65345320142.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085533ce7ef9---tesobapu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d25e3e5da---foxixarepobunedifokiwoki.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5b3b346b609ecba29133e55d4d4893a8/joxisodaxigerabuxijutit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+to+lavender+town+in+let%27s+go+eeveePDF 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_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 19936 bytes
SHA-256: 2d957d551b9abaa90f4167064bbf251fd7149fe23c0d647a80d94f89b51c4600
font_02_sfnt_off00016dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDE 10600 bytes
SHA-256: 3385cd68f24fa002d4f379c122080aed24edd3b38a9fc34d71e087ea196f86d3

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