Malicious PDF — malware analysis report

Static analysis result for SHA-256 615ea3decea48828…

MALICIOUS

PDF

98.9 KB Created: 2021-09-17 15:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80b84f69617b4e0543e0ad2d0cd607b6 SHA-1: d59d1733cb2a7703dd536b40cd4496edaae977e6 SHA-256: 615ea3decea48828d634be4385d6e92ef82bc4d4f1ebff728a50e8c6ee38d452
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a brand-impersonation lure for Amazon. The presence of multiple external URIs, some pointing to compromised CMS uploads and disposable hosting, suggests an attempt to redirect users to malicious content or phishing pages. Although no scripts were extracted, the overall structure and heuristic firings point towards a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fundamentals+of+building+construction+materials+and+methods+pdf+free+download.
  • 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://minjar.mebel18.com/uploads/files/xagexaxutivuw.pdf In PDF document text
    • http://www.binghan.my/userfiles/file/xatomobimemiwagivorolize.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/93638209590.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/wemotolesifowalojipuno.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/25210702949.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/61634994229.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/29390313218.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/devavufip.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/zupamegolugumowuwifo.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/63987660978.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/37945063445.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/49797323775.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/damefasesubifovuzisikuz.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mitafipevuleramojikutilur.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/kumovuwujatagetavid.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/99nmmnmpdb5caj3lu0hpjtkrme/dugezutixopazadexipojavuf.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/43991025611.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e445bf618---kafozevekewasudenubugiw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613757fb5a46a---78030509656.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/84680530856.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/49253761542.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/371fff78d20d068e0d5fbd4ac54130ae/fesofujubafereveniwag.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/31444352159.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109160053537796.pdfIn PDF document text
    • http://sciattella.net/images/file/9938620229.pdfIn PDF document text
    • https://svltv.in/userfiles/files/bazodavezakexegedukiv.pdfIn PDF document text
    • https://mavibusiness.it/file/17846456497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fundamentals+of+building+construction+materials+and+methods+pdf+free+downloadPDF 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_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 11372 bytes
SHA-256: 0e5327b6378bb2e44f648190bfd9bd82bc49a4f1b50b5b84077fb018615bd48e
font_01_sfnt_off00013423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 18792 bytes
SHA-256: f444e09a7be3b62ea67305c384f1b2aedd11fcc0b0d22072ae0fe4ae3bcda644
font_02_sfnt_off00016493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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