Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd6ec604c8834f9…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 13:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f568697df98522827bbe29798a1ac63 SHA-1: dd3d9db345eede1a5627d16f394bf29a0ed412d0 SHA-256: 8bd6ec604c8834f9e1968c7e616c1e0fe9756e9d65a2fed261dec0d3435cd2cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a raw IP address and others hosted on compromised CMS platforms and disposable domains, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=ymusic+android+auto PDF link annotation
    • http://chandravanshi.com/userfiles/file/tofezijakuvonixemugo.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/rusobixusidalonufo.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/30004209374.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vudug.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903093052446997.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/volevinolinezuwatubexir.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/hlf3mheq9f1ttdmkhj2ak6l8p5/zufefuxafajizalot.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/nixafujuluxuvoz.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/26524095299.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/523cbfd0e2dcb01e9eade9d903c5e631/8725141765.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/63532458066.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/maxesajupozusuve.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/77342214195.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1a1a33b75dbd8143b5932d3b48f1e3db/mufebavujuposusepogije.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/zugivopidadoziku.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/85100618907.pdfIn PDF document text
    • http://upakuika.com/img/file/dujizazudutos.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/45000207443.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/92962751809.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/67382878213.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/fivufabasat.pdfPDF link annotation
    • https://abctranslink.com/ckfinder/userfiles/files/30481322767.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 21220 bytes
SHA-256: b326f06f511901e38abf3353d0ee647d5e19226197a7db0f0a737d3014e7412e
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 16396 bytes
SHA-256: 7068fa11e4f0d78f85e1638ed4dad3f699da795796205c4200c5982ef8369290
font_03_sfnt_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 10436 bytes
SHA-256: f63f3bf5c006b1322ad30df91311d2ab8eadde7d3140ea40472e9f212f5e86fa

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