Malicious PDF — malware analysis report

Static analysis result for SHA-256 5512519e6f39708e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 21:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 222de8ebac429a350d537282ca95220e SHA-1: 199eb20cf46465caf82b8a5ac5e0bc65730b47d3 SHA-256: 5512519e6f39708ecddf032d68c6cfdd8c132885b796d34fde1cb31116467445
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic imply exploitation of PDF vulnerabilities or social engineering to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://helenhotel.vn/upload/files/93068052639.pdf In PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/86939268191.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/kofumolulujozab.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01a9b56b9---kagavewevotaliluzi.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210910170632.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/nerezujukasegokisiv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1ab0e70a---vodopudu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s27je8it5d5inkrkb0ccbm9210/riwavuvu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc52a03b1---wevenijipidevovojopisibe.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/likegur.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/4396630311.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_20_24_22_1055.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/gokamituxunuvudovusis.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5f6f6869f0770afea2306f50a40c114d/xepofuzekelobikoxikanob.pdfIn PDF document text
    • http://czyxchem.com/upload/files/zuxetoviwipomuwomaxuna.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/2949395298.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/kabamu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee21a04c9584ee676216d1f7e590ac85/favibizet.pdfIn PDF document text
    • http://strandedtattoo.info/file/zamabozumodelaravasid.pdfIn PDF document text
    • https://manenshop.com/upload/files/69949289034.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/73997962151.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b026d1aa---53924244078.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/60739306554.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/pugopujajemalapinen.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/30123560235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what%27s+tty+mode+on+my+phonePDF 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_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10560 bytes
SHA-256: bb8ec5badc5054c0a025c465e2efac231314a22d02dbd3202ccad5e70f4a24a7
font_02_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 18088 bytes
SHA-256: 08db56b35dba5809c58b32dfc5ca043aeb41d7a92ce6b4336bf1ca4339d50fd1