Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf615d2ab1ab2936…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 13:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cea2c08703041309eceea9e97929b4d SHA-1: f9d38848987e116c15d176485339830764af0d97 SHA-256: bf615d2ab1ab2936397ff76ac7f67b3ff1a7152f18830c8e50b9cd30d13d507b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of URLs like 'synerhu.ru/uplcv?utm_term=sample+email+body+for+sending+resume' indicates a lure related to job applications or resume submissions, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=sample+email+body+for+sending+resume PDF link annotation
    • https://adtw1.com/ckfinder/userfiles/files/81106551251.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/fitiwomazetole.pdfIn PDF document text
    • http://zuche0551.com/upload/file/wipemiwuvol.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/55892238298.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/66091218173.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/maretevotugulux.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/20377721708.pdfIn PDF document text
    • http://cochemical.com/upload/files/65708017178.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/posebamiz.pdfIn PDF document text
    • https://quizai.com/uploads/files/89926889103.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/73297491019.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614346aef0b03---suvozovujotusunedutiru.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/96862077909.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/75815179227.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/zuwefijoxubupi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e3e9e9e0---64646218420.pdfIn PDF document text
    • http://bdsductri.com/upload/files/wapasinozadozixidagame.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161463a0b824bf---23561771697.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c81d96229b---letoremumi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a402b467ef91b93259d54c0e9d46045a/nuxap.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/fazudunawubesugo.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/25363677038.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406906e0a39---javewopijolid.pdfIn PDF document text
    • http://www.pilartangguh.com/file/nexupiwowinixapovo.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_off0000b7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C6 17544 bytes
SHA-256: 7df21a669e957f6c6afdeb1a2d89be7ddf059058791b217480ca6b0a87cbf874
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 11172 bytes
SHA-256: 12f664fa945c79033925b80831ad953860a92099a22eeb23611b17b80697d547

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