Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adff8e4eb6330f1…

MALICIOUS

PDF

82.2 KB Created: 2021-08-28 17:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27dc0ab2dde0f4941cb1438436d0f217 SHA-1: cd77e6f5399e7fd71879113a73578bb87862751b SHA-256: 3adff8e4eb6330f16a9d124eece0eaf85e992c291be44193b03c63677c003c30
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious, classifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL analysis point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laurallo.com/ckfinder/userfiles/files/88579283716.pdf In PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/xawara.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/kezixob.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb648e7f046---tipinu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i3krs2mjh7kk0qjbf6pspv47kc/48068887476.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2750824872.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc8f8aa7f4---25009671531.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc9ec5f961---kefel.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/84286264281.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021081918354870554.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210624044528_07ggte.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/zaperametaxefiwif.pdfIn PDF document text
    • http://billsky.ee/files/file/givomowogimijexaren.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/nibosobevazukakoduvageset.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77f7eb782---mirosipogopadatulotag.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73c666e0f---dafebivekefalulazosu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784fbacf60d---12238710006.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/geteruwaxugesikozuvifiguf.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/26463051548.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gumosisoditedalowabaxe.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/6253695831.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/rslfql2bf80808n9u5l391f3c6/82313668505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+do+nights+in+minecraft+lastPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 17716 bytes
SHA-256: 0c717301ffa5f3f2244b8f3ba7267c80014d9a78bb4a4f424cf3cd5804dc454e
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 11000 bytes
SHA-256: 46217a57b410062c0f53988ded7ffba56dac6dd6e39a464b39754f8925e34119

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