Malicious PDF — malware analysis report

Static analysis result for SHA-256 af44a1376908f6df…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 11:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f021653c90c4714ad84e43bb27081622 SHA-1: e968ace6b715f50d7683f34586b3e9b899f9d667 SHA-256: af44a1376908f6df8561558458e70ab708a7b6a51b697a19702cb59fe6dc6d71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=friv+only+the+very+best+online+games PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/menetujilafidomofevoram.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s6m4tskpmct8922gifv0lgnfvu/sejixidelibijenevunetipak.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/patarilope.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/goxizixesanovadozid.pdfIn PDF document text
    • https://birudongker.com/contents/files/96163721669.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b38fce6c6cb42b665e4d11bd9e27d75a/jenomarele.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/10638436748.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/kakesiwododixigajawo.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/77294896068.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/nejeraxusava.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d18fc309c7e04ccfcd839ebe007d95af/86857274109.pdfIn PDF document text
    • http://minerva-collection.net/files/files/94666149378.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/xukemugefufasevasan.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/36540908299.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/zegaker.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210919_870D67E5ED96A061.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/nedujezoted.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/85069619848.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/solexofosisapesak.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/labuk.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/juzofujatuvolo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/52893180300.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/nenujobafizigu.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/13541458746.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/57112712260.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7fe90f8b66306df95b75e91507405502/jatejumekizaxujukobego.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/wurubajibawamuwebaviwer.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_off0000b40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40A 15584 bytes
SHA-256: 0c659b400430bfb1cd4e4b21a6d8d70a2973ff4c486eac55c76c94fdbb87df4e
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 10852 bytes
SHA-256: a907c945f2994d6df53f231ed41135ecd5adec5485cabe451e74e642497f34f4