Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bdd3195bc14afd…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 17:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 845f01fb9e41fd8e1a4b893dc6e05854 SHA-1: aec29f8ca064d6f2b6730446c9c0d9e92e6a0899 SHA-256: 87bdd3195bc14afd33210d62d3bca6778b26f0aeebb8ac725fe398723ef6ef85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics confirms the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chiesamadremarsala.eu/userfiles/files/salapawabawepe.pdf In PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/julimagesuzaboxuli.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/lonatemavajeginorabonoko.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/64624594931.pdfIn PDF document text
    • http://surtek.biz/image/files/20150331_181649.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/30570219490.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/74531334273.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109071447154686.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/nadob.pdfIn PDF document text
    • http://ecole.ru/text/images/file/57370708829.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/misatesaninomovom.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/rapasunetivamubeligapax.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/tawepobave.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/xufunabejibakivesison.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/29822553829.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/34398748915.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7deb16e0---64119785965.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/74507685156.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/68454124728.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/82283310478.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325bf03322d---tolem.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407d19b0d76---8966317446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=one+trick+magePDF 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_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 17904 bytes
SHA-256: b62628413247bc89a8a1d53282fa6adc11871734773e78d5dfecdab3bb01e5a5
font_01_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 10356 bytes
SHA-256: 39fd078e4f33214a133c95b056f141e48a526200c0ef87b84fb107e940163a7c
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1