Malicious PDF — malware analysis report

Static analysis result for SHA-256 b905e8b2843efbd2…

MALICIOUS

PDF

71.6 KB Created: 2021-10-04 05:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d006a06151c5a97294bfd906f760a94 SHA-1: 6325f893409af59b879e8cc158706361d289907f SHA-256: b905e8b2843efbd21e47476c959f1acd7194e688775785775a95e9a5442e9180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=indian+bully+puppy PDF link annotation
    • https://dazhonghua1688.com/ckfinder/userfiles/files/kipadibaxevajimej.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8e85e103980ddd1efbfa166e0e7fa1d0/74761072769.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17dc8800e---mizozasigigadezutop.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/41897840447.pdfIn PDF document text
    • http://darec.sk/files/files/besugigek.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/pedikixenorad.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/64eeb7fc819a3ab6d4034de0f41b60c0/robilaviven.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/29077180613.pdfIn PDF document text
    • https://norservis.info/files/files/82773546860.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/76874569838.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xodemizejotafovenu.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/tibasoxevapuwufurimafowe.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/fojol.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9d8062262dd48d02473a61208e702b3d/laxavokug.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/woxemewuvomonagowoja.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/25896044113.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/49980141210.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109130310495475.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/setomudokavelo.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/85480280097.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1118765325614601a55c29c.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/77948902737.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/rafowosof.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/fesob.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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 17704 bytes
SHA-256: 03b2d26c44f88bba1135efb70901f63fa1bdf5004088707ee4a37715185e298c
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10072 bytes
SHA-256: 5cff7c19987e54b07c3d086220c174228052c68ec2a07c34413c1931337c6390
font_02_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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