Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f050f2f0f50c02…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 14:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e191b26f17e454449f1d686f6080eb8 SHA-1: af81eab965ebe6f5f80599518178be943be4cc96 SHA-256: 70f050f2f0f50c02317c4184c15d83e7086a1021b40cb22c03fcad80c0259b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URI heuristics and the ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://crysiq.ru/uplcv?utm_term=ppsspp+best+games+download PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143006e70ead---31453370257.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/38450897940.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/998d23560f6674e862d8f313e03b07a4/dedalinorikemutofotez.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bidasagopek.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/1993993571.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e378bd681---luvovamebiget.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zexixosafakalokevunob.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c84bbd297---gazotaxolinexo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/negaxabo.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zawurorufutuxuf.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gafefafupigeju.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///poserodikonixerovixeta.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/tojezamarud.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/sogubatukirovitelimase.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/52801871092.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ca602b3f71a1e4c22cdf8890b39631db/vojozikufaripawuwow.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/68988844770.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/gisodalasow.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/xanitoxidamobugaregokop.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/kudamuw.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/24640465808.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/53707112222.pdfIn PDF document text
    • 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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10772 bytes
SHA-256: cc8a1884d62202fc209b2ff517e43d57cfb2f3d565b2009d54e2b99d3d8a65e2
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 17140 bytes
SHA-256: 1f124fc4285d2d04279d18af20505c689846720dafa3ecd6edc78032d067e74d
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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