Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c0fc0192274d52…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 18:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4711c6b2316f6e0a1d90082253573a47 SHA-1: d0a1b6f1531a77742f78b7f65eb456d5bcb8cb20 SHA-256: a8c0fc0192274d52711048ec0d9d7e4ea10b5501085e1d19b0a075288dca277f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=creative+careers+that+pay+well
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/10cafda5d5137c9aabbf77dfc5efd5f1/68050634967.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ab8e1d2b---bodakamag.pdf
    • http://filtrydokoparek.pl/img/all/83509767915.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee840561c1---71486654332.pdf
    • https://stdtekstil.com/upload/ckfinder/files/xilupuvifunapakazutawixer.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/41342312749.pdf
    • http://imhkayseri.com/resimler/files/68274689502.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b12927c6f8f---60540382775.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ot7n9tmb2l48i2hen9c76ibahh/37306875013.pdf
    • http://medob.org/SITE/files/editor/file/wepefiwi.pdf
    • http://palami.by/images/file/82475333890.pdf
    • https://angkortaxiservice.com/userfiles/file/metifiromexutoboxit.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ccb47fa537200bbb045800f465b58ded/95282297918.pdf
    • http://amphorabeautyclub.com/campannas/file/xaxififanalevuzerulaj.pdf
    • https://tipresentoio.it/images/file/radepeku.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f535efe4---92414076365.pdf
    • http://charivne.info/images/file/66320311953.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9b82aafe128dfc24688a25734763e15c/fatanupirumesoxe.pdf
    • https://ewt.cz/res/file/28313598481.pdf
    • http://border-inn.com/CKEdit/upload/files/lemomabetapazanudam.pdf
    • http://accessiblevehicleservices.com/userfiles/file/96323480970.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35b05f2a4---mojosadebadopakatelatife.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6bd8bf2c---migetapafulitazetadutimi.pdf
    • http://agcslohian.com/userfiles/file/susux.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fnj50j6cbcc7jjdts52tncfdua/zuwoxazotuvupuki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 16792 bytes
font_01_sfnt_off00010f46.bin
0e8da741b91b4950951a6bc62d9c3124899143914976c7e66a36b73a008e3ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 10544 bytes
font_02_sfnt_off00012787.bin
648452aed3edd199335ea4f2b32ba3d22e6bb6d74f75895a8b8fcfb3617f3d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 17420 bytes