Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1e687516fdbe68…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 13:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68ca7d46e30bcd44d95e9a972779a571 SHA-1: 443c7a6cadcb0b0c89f3fd7757a2cb8ee3da345f SHA-256: ab1e687516fdbe68e9487b95f0755e7838ccc7f19095b9959081f3c6245f6593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://baove24h.org/upload/files/63800303547.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613278dc06268---62770489285.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/tuzukafemujofin.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/zirulevegovipabe.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/48688872754.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161371debaf7b5---fupefijenufuragixeleresuj.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/gekixurojogu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613717db1b9ab---giwizimes.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/43385752441.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/9346495288.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/zusaxiw.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wajoxokezizevibewavare.pdfIn PDF document text
    • http://eva.am/files/e2abc7db759612c9.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0910/c68c8169524a74f5b2c1de9fba4c2672.pdfIn PDF document text
    • http://staropolski.net/Upload/file/50740210293.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/89970926199.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/vixujusituvivib.pdfIn PDF document text
    • http://japhina.com/upload/file/peferegukuwupoz.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/90310548791.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631171409.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/jukezugepije.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab5f37512---wejif.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/puzokiwivezogow.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/63602985487.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/zawodot.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae35caa41d---vokevali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unlock+home+screen+on+androidPDF link annotation
    • 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_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 10904 bytes
SHA-256: 11b75398036079635a04fd55410042ad83c1eeb9b3bf4573431cba2bbe877217
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 18644 bytes
SHA-256: af512c3ff43d5d0dc74b1d6749a7e43044c7616dc7b0338867ff0e4e3583a048
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.