Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b623cfd4068393e…

MALICIOUS

PDF

88.3 KB Created: 2021-07-30 13:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7702ae3804d35e7b9402a5f866706654 SHA-1: 2418726b9fff437c41cb90d547af0ca0b5283ebc SHA-256: 4b623cfd4068393e4dde54d05355c1299e4567e65dd60876f03a3d5273b4d65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=coraline+movie+watch+online+free+no+download PDF link annotation
    • http://asbufestival.com/uploads/FCK_files/file/rovikazege.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/tifubumofazixupiloxaf.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/41158048199.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/bilanaliva.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0bfevdj8pfi8nca7lh8s9mgnq6/wopawoko.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e19be142e---55781403201.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071246cd4c02---56138293255.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/xugokeduzo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/97ed5477941a5853ce87f84f0a2442ea/megekejuwave.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/jinoxesefu.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/fokabafomemufitapa.pdfIn PDF document text
    • https://menu2uplus.com/images/file/madukunugopizogus.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/83163426254.pdfIn PDF document text
    • http://fxmeat.com/upload/file/8396bc2dc4fe2fe6886287639121128c.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f09567e8983---jojuketuzizajimon.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaa67e12e5---pegubanenef.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/08ced79566f9c2ccf46f1ccd9193efcd/lipobubidobamo.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/94640935633.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210628173336828126ob9et6wz3k4j.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xojelizo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/51766230075.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdba717e5f---fijuwarogagugujalujujitip.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/bowosasodurid.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lekipobelezato.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_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 17260 bytes
SHA-256: d1f1228e3067f2f7eb9a4750acebab592857cace8437c2d23d758d1819060cf5
font_01_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 10756 bytes
SHA-256: e289664eb1cc3cd20c7537cc4dfb59297ae3c7520c1198928d40f0b7b716d101
font_02_sfnt_off00013a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1