Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f83f2ca1e79e9d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 04:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67e86852b2b9ea4507d75b2af0bf363d SHA-1: 68e18611a5fc4a5bcf837fa1fab473a0f2bae341 SHA-256: 80f83f2ca1e79e9d066efeffc935664d8a07181cc66bb7fdb811c151bf910206
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be SEO manipulation or hosting potentially malicious content, rather than delivering a direct exploit. The presence of external URIs and link farms suggests an attempt to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a76d6653bc44f39f240f74c612e8acf6/tajufovumotofazosudiwez.pdf In PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/63659354838.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/24292045179.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///18427272244.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/50ea7jogt0cq6urpc5jahjus27/46263153772.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/10510671636.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fd04ab02ae19cbd10c29c49a398a2452/pakamefefajatemorilojalem.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/parus.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1b67d130---sukikowesivor.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4ji380118efm8dhui417lu75t3/73544422844.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4mgo154amtekk2crvsno2arbl2/20949271884.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rk3bsaubvqqa864ttk9sq8oih6/77468550086.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/63804388072.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/fojupu.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/51421112894.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc729db00---wemefatiliditasex.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/29192439314.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608005c821214---5007291714.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210504041925_1028741103.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/e2shauam5vumjtv86bikrh756m/10188915446.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/7365969073.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d67de81ff---finukakibejuwerejixoguz.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ce52ec717fb95061b581bab042cee8b9/38856761969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mastectomy+procedure+steps+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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16828 bytes
SHA-256: ed438e2c1613032a3065c9e57aec8d165e477ebf34aa736df527ff617903ec63
font_01_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 10748 bytes
SHA-256: 54196d5ab2b27ccbc20c3623d49f2361369956355a9989dc0c817d9e5252ec35

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