Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf350bed2856c0c…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 19:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26b9b8487a0c3f2bb885a99a583f5df7 SHA-1: b61ff37804fc3f06cbf5364b4d2aa4f09341152a SHA-256: 7bf350bed2856c0c324f3df8c97b59b670292bffdb6d7d30867a3a1dae052dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a mix of compromised WordPress sites and disposable domains, forming a link farm. Heuristics indicate this is a common tactic for phishing or malware distribution. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=neutron+music+app PDF link annotation
    • http://gostinica-domodedovo.ru/files/woxuwijojuweva.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/49474670878.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/matibupafavibanetuz.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/pijiravemorini.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/raroketamugiz.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/fofunapokutozosuvolupopes.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jodobazometadizonulujeg.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613165c838124---jajopedozu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d82b2a0190---43150908951.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f95f80a83---xewatuso.pdfIn PDF document text
    • http://chinalabware.es/d/files/15529586766.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fuzusesik.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/sonebokosinipusov.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/27558597787.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/wibabub.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86e86f87c---xabarutiwilizimonelis.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/lutinudalufirujik.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ae91439171e0e16ca37e860960e1b80b/37028734630.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/47833782741.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/powibabuwevitagofow.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/retoxexatalogakaxerexawiv.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/xifilasazobokudajagejo.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/jariwokotogat.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_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 17628 bytes
SHA-256: a332860b01a7e50afd00e68523fd9d6b6cf63bd72c77216c66479ffb17aa213b
font_02_sfnt_off00013d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D74 10564 bytes
SHA-256: 97caad317a5f99ed604906f6391038a85cfddd63bbf3f0b34978b2c2fcd403df