Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecda5f3c5a98a917…

MALICIOUS

PDF

91.8 KB Created: 2021-07-01 18:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 862b4bd1b5ef1f13e9664968dea537c9 SHA-1: 9f16a43c531f0ab1f1a92f98cccde676a7a25c37 SHA-256: ecda5f3c5a98a917b8359e24bd7bd9e534b008eba4370bf3178826afc8910c6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=cinematography+in+a+feature+film PDF link annotation
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04df6e08b---regetomixusikibed.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/salamenadogetukenik.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/40556ac20e285bb40f075474048e4434/5933507652.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd33040a49---tufabojofokemawe.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-24/images/files/gesexulemutix.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8bvl17ccb2hv1ha9vrr776ugh7/ladew.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/eb35fc4bddca297caa23f53b98c66f8f/60351911201.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/8697934057.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/87573208167.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bc453813---fiterurabirunorad.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106201243236173.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/566bbf2b976551018c66fecc26e5ea1d/vesokalu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/75420701343.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gnl29ctmnq4742a8fc0f95mel1/lewij.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fologef.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/78458332222.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/68317995313.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8cd852f6fd4d8e8ca1dfc376b3f7027a/mewidaputa.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4493b3d2535d4a99cee37ea47ab165f1/digamegezexavirofaligo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/01erhks3cgvpvl6n18ts6adr1j/sixivuwarepu.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/mitakuza.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842afa826b---79643197044.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d41b974114fb05964ef76f90f262be1a/texexeximefogiz.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_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 17568 bytes
SHA-256: 23bacbe282732a305a13b5622d9a57700f17cf777f919fdd32291aa91bcffcb5
font_02_sfnt_off0001493a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493A 10884 bytes
SHA-256: 2cb902faa3423c3a7ad5303c31d82e1605c6c48cd9bd978df2e468ba443b8e20

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