Malicious PDF — malware analysis report

Static analysis result for SHA-256 99af78d873e48560…

MALICIOUS

PDF

97.9 KB Created: 2021-06-30 06:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: abc2019554873411f2068f04ea53b047 SHA-1: 2ee0bfaa151133b6e8e92d0fadcbaacac0c294ef SHA-256: 99af78d873e48560f1cd5fc9184027a3715888929e56dc13084dc13074172780
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. ClamAV and an ML classifier both identified the file as malicious, specifically a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://anthonyvienna.com/sites/default/files/file/veloja.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac060d833a1---vojofaxejobevoroweweso.pdfIn PDF document text
    • https://anakmeong.com/contents//files/36938534463.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mukigevuloxusaxofobe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0db1dc7edab6f120d243c2c2442b15f1/xobiji.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/a20jh5r52pjuvq2spmlpenlcm8/vagiketesesejelinojofoni.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b50e4de8---87735917283.pdfIn PDF document text
    • https://kawanmto.net/contents//files/pixewogixut.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc3a99b2a---38305508039.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d86a5c74a---mudodojefafelobipavaroz.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c43fbab99b6---9065397095.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b356889f569---80507980361.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vtrrj6eoddjf1cim2bbjotjf5i/90144695079.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8224f695---69100461405.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b317d13604f---25966140256.pdfIn PDF document text
    • http://beiks.info/public/file/lupebumoro.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/bunuwuvesuwu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058f381acc---kikuwase.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/99752098071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+savage+insultsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 10280 bytes
SHA-256: e4da626a77cd6a6bbcc62f53792e516895c46886933ebcaeb718607284c0ea17
font_01_sfnt_off00013519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 17548 bytes
SHA-256: b21433d4ff598e75016c30571148ffe33d8117422b4852b82541246a07d37ac0

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