Malicious PDF — malware analysis report

Static analysis result for SHA-256 686ef264dac05c5c…

MALICIOUS

PDF

105.3 KB Created: 2021-06-28 05:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ff34c56ffe8c0f48629eb18abfb364b SHA-1: bed8f5e18040b86c7776e4627e496b9bce9b817e SHA-256: 686ef264dac05c5c27400a5a4647bbf9ed99a40d291d1678097d56f88a859a6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160956215aa96d---pezonopufe.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d61377b582b---monizefikukivilemugutas.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/zuzofafojemigisiwisaz.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5a5d82a9---61949968636.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160876e685d999---siginazuwa.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/20f233ab7320a3f8d733cceeac9c6cdc/61599259563.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9cd64ae94851c14b8d67247772edf952/wigenotogekonexikoteve.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nawunesapanasetazub.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/65765101764.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/43172074268.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/63197027255.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb668a---peluwabab.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086862d00e10---98794527731.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c307ea7ef0b---jowibuxawozugivukumo.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jopixuxebewel.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/69694713f766f5b4daa4ee0122c2aeb1/wuworumulidebunamatonup.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/xadisesu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/delasevefazepedeweb.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/80lfei2s5e4tfb6hdmjopoukj4/60470492751.pdfIn PDF document text
    • http://rld-carbon.ru/file/15817124786.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/newevinobawodaxujilu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a400e93b2ab95ba96e8c089de285ce98/jusiragubolosesodafapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=questions+to+ask+fellowship+interviewPDF 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_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 17668 bytes
SHA-256: 1f71dfcb5489b3d2f4429765956ea370ad2fdfbc46f120138ac52f326d90bd31
font_01_sfnt_off000166b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECA 10856 bytes
SHA-256: 562ee06edfb7e493274e32f074bd54afd3b1dd964b1cbaeeb3e4110ccdab9318

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