Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e7c2b7aa17c817…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 00:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0d77c8806ac0edeb83b49aeed21e6a6 SHA-1: 5a93befee074c957fe4e0f4a6152a54b463e7efd SHA-256: a5e7c2b7aa17c817a61bc257275b41d533c209eb400254879a382b74da5689f1
224 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document likely attempts to phish for sensitive information such as passwords or private keys, disguised as a recovery or download process. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=android+multi+tools+apk PDF link annotation
    • http://ain.proximeo.com/ckfinder/userfiles/files/837822042.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/15505327979.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9f334915---87589921251.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/28127371389.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/silusefunof.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/17547220645.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/22119598023.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/55398656860.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/474b259f511a8f7a976b33323af044d1/10762247888.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/14747817941.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/gewevupopugojekevadofi.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/lelupapofidarig.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/kalosumagi.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/kujeder.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613176f4ecac6---gusifurofixukosaluxije.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316e74cb0c5---kopitazigurodexagesudo.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/29768861636.pdfIn PDF document text
    • http://leguido.net/files/73179782557.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pavasupozowe.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/fuputezewonodopip.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 10596 bytes
SHA-256: fe41c7600dc5f212d06c60b35449f35d8fc8705f854e8a9a2336df8f629a2215
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 17964 bytes
SHA-256: dae49931ccd9d220a7a31195e6421a98373a968a0ddc77a29e2553e60c07e2c7
font_02_sfnt_off00012876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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