Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d26b716db14bc1…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 17:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 873c3db675ec97794dcee3194ed3733f SHA-1: e986f5539772ebe3a4c6a9dc91764fc4c87660cc SHA-256: 10d26b716db14bc1363f0035744bd0920c582d2f21b5ad581b4c30a6b495c9ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989122d47e5---28322236948.pdf
    • http://cleangroupbd.com/ck/upload/files/47876203034.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c78dcda461033479e01faea2d2f264e9/75763879347.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7e85ko30lkrt1mp7ql0lpj5ojp/venik.pdf
    • http://nuocmambason.com/upload/fckimagesfile/b1e23fd5ba5a367246ac452f54775fcf.pdf
    • http://handgun.ee/media/file/magetutozetazebesul.pdf
    • https://korzo-galeria.hu/files/file/89671686431.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jb541p9qg2oi26shem7ui3309q/68285464329.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/haupjtcjjo87lokj2vth73qo0k/31804789641.pdf
    • https://kede.org/userfiles/file/24962952595.pdf
    • http://aktifithalat.com/resimlerfiles/vegipe.pdf
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc61aa6bb5---78356858170.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608154e718d90---falasimo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f040a266---teragejaxiniladotuguke.pdf
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/filepobupojexune.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e098abd0---zisuwudexes.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1e54a1c714f0a4de407ff869df8bb6d7/dibojelivotexed.pdf
    • http://ceomit.com/fckupload/file/denilijanozare.pdf
    • http://sammyurias.com/userfiles/files/jazujugemigu.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b89856d2---15984957640.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8d2a17cf156f7796c44887252c38091a/14049238076.pdf
    • https://nisahanpin.com/calisma2/files/uploads/moforazejoneza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ottoman+empire+dbq+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_off0000bc01.bin
6116e8460bfd75db1c6abe3a23b6632e72d0e7c23ebdb4fd4dcdba5c8f2e52d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 16728 bytes
font_01_sfnt_off0000e6ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16792 bytes
font_02_sfnt_off0000ff16.bin
829dec14fa0b5b01aa78cdfcea9d0c737a3afb0e9a39ff097c0e7bb72b7ab00b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10756 bytes