Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84d8eae985a81f…

MALICIOUS

PDF

100.2 KB Created: 2021-09-06 21:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1befcebfbcc323c95ca943ad872c689 SHA-1: bfcaf7d5f554f85cab9ed5e45bbc7d48adeb00cf SHA-256: bc84d8eae985a81fb55406d3cf8364d896c5de665cbdb4b16e2ba28dd2cc6e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with techniques used to distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=simple+machines+pulleys+pdf PDF link annotation
    • https://rosewoodcity.org/nbloom/fckuploads/file/9213239270.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/pozofevaxuzosotujojuwo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/odeuj8b7lqoi8flf8b31fm27o7/58211641186.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2de0b35375d2851761c3deed71373481/99564898834.pdfIn PDF document text
    • http://xn--80aawifdlfr.xn--p1ai/ckfinder/userfiles/files/pozomipeferogagodaliri.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/22290747863.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210627/file/46653807157.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/66991884850.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/razedetoxowowu.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/70983513380.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/mulezetom.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/60856798388.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/nozulutekidazeno.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/79517407016.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/zizatutewamodelozob.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xuzetaxuk.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71a848f02---sawufokokekowifud.pdfIn PDF document text
    • http://unseretochter.ch/images/file/77130904054.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3a013575---fuzizoxobafujuxuweveribug.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/84559238464.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/90086212486.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/iiptt7d27m0ek8ok0brd40ftus/zabogamadi.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/37537163666.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_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 20004 bytes
SHA-256: e5e515c7dd7708e01cf80d82999e1beb43fdfcd1e986fae178922ba4edf41b47
font_01_sfnt_off0001522d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522D 10856 bytes
SHA-256: 792cd9fa6ffb5cf6514e104721ee1e779267767985eb4c4a066a551328990068
font_02_sfnt_off00016aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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