Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73c2d3f546cf61e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 22:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 526a25a2d504b2f42df507b71a5ea738 SHA-1: fa0c9d0167994ab92454f106cd12914a51eeb318 SHA-256: f73c2d3f546cf61e06db684de1718e856419ad48379c4133b8161b44696b771f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=website+zu+pdf+firefox PDF link annotation
    • http://nessium.fr/userfiles/file/82633299353.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/66e8dff5bb758f18659788aa6077d1a3/14134731232.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e119162df0d---fusodipixofomegosewu.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/gibevimilowexafufil.pdfIn PDF document text
    • http://abpaluso.com/upload/file/mufumodo.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/18867937226.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/ludunerijufa.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gagubisobo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d689d4c86d---62266354238.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/udrr79ik04bj64sqnl31q2p557/zomaribiw.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072321460375.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-28/20210628134444159097.pdfIn PDF document text
    • http://vlajamo.cz/images/file/dawumajuruxefapoxifuwek.pdfIn PDF document text
    • https://led7.ru/file/824447689.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1046782f---lovixasumomuxiruturati.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/duwug.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/megodowiwananamezijofiv.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/meguzibetisibifabugavi.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/65665884482.pdfIn PDF document text
    • http://tion.hu/upload/file/81493736371.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3b9893ef---kedasoxilagigumufejikiwi.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/javufaxebezapifuj.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/96652156080.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608106081cd08---11704529614.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_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 10576 bytes
SHA-256: 7306e4d138ef100ac494f1bd98a5ce2e087f7c5e4fdf2841827430196213ef07
font_02_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 17344 bytes
SHA-256: 5903e28e13895b1c4a62e1ae048647c082addd00191b42658965c6a34d8a14c7

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