Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1750c1f8eb4debb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 05:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f2c172b3ad6bfb3fd524eaf7bcc7dc3 SHA-1: 32a1d15ec821988ccf37c22ff5fe85769014d0e4 SHA-256: f1750c1f8eb4debb35e2cad58f209570283a48c467bd9ae2eacb21384d745ec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, designed to redirect users to potentially malicious content. The presence of external URIs and link farms suggests an attempt to distribute malware or conduct phishing by luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=gta+v+5+for+android+free+download+apk PDF link annotation
    • https://7mark3t2-7aya.com/contents/files/muxexu.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/57321208248.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/49510503043.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/80421248096.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/9718894644.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/kalibejizusogawopunafex.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/932683de80e025f66fcc3559e862e50a/zebewekiwijefemegije.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibix.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/goxexodesat.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/71251084708.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/sevinuwepux.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e363244245---43620465200.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/vuwefiluvisevizixuza.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/44661497249.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/vagoxigaxefigiki.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161492af24fa43---kuxisodofit.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb54971727---kikuvut.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210906/file/62159535269.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/33948817124.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/buwerefibu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/78938497417.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/maxadogotiwig.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/zuniluwuwudurelekodag.pdfIn PDF document text
    • http://z500.si/files/70522321564.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/48269970132.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/janefemegenafidajuvuw.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/8990602913.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/26724742649.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_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 17224 bytes
SHA-256: 5341eb8d77c9da09d3ebb6a53ea19cfefe999cb794e1390a8ad81623f1da2e32
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 10740 bytes
SHA-256: 49036618a1492c8e687e37ee9d1c7fed30c518a0a5ed60497e4d4b8a9be14d05

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