Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdffd4a4f8c3e32…

MALICIOUS

PDF

81.0 KB Created: 2021-08-22 01:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcc1f6ac49c49190b522d9f72a20688c SHA-1: 36894c69b0cf4a7bd0208912c13a18de6687dc58 SHA-256: dcdffd4a4f8c3e3299d928d1c304ef6645baa3b3ce9f1f47a44f8bd229305613
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kurumakaitori-one.com/js/upload/files/bovebigujuxulagowefit.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/169ac4734df3068282e3f1f2489f3878/bofilepituri.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/89402550587.pdfIn PDF document text
    • http://usmleworkout.com/files/file/11399484172.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bcff8a2fc7372d3629f7b6a66d51ef69/84688424937.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb585aea81---tonowovaveruliwupemize.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/damapirize.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/gixirorapudukibijotudup.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501001541193.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/80148101348.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb47426d588---35498007859.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/wirabizutixalonamalajurit.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/9tivjs33mh4q3huqo9lk54hg59/nogebosusa.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/2577115706.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c733937b5c8---kujogidirim.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1527513005---fopilenaferubuko.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/40090744794.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/32bunt90tar40bd18cgih4r9gn/wekosawozuturelivebax.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/11698540471.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f0e659d63---ragawuparagenom.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/darijujixinojozijewiboroj.pdfIn PDF document text
    • http://domario.ru/userfiles/file/kadakasekoruwajorojeze.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2e4c00e04e68dab28fbd256f36be52d7/vuzamavip.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/97290459367.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/dewiwosipexapexobugij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=2015+ashrae+handbook--+hvac+applications+chapter+48PDF 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_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 16288 bytes
SHA-256: 9711f4e4040cc936dd55ac23ca6cc36850ec92ca5ccd09242bde8e98c2c0e6e3
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 11560 bytes
SHA-256: 832eb4a75935697da8f9ff6ae2b7b67ebe0d25d5b228d40a0fe00693d7e8dc0c
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1