Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74b4c81f054b0d4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 20:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f60883c317078b667e907e1ba731c2c7 SHA-1: 8b81320775cbf4fa4dc8940e64b8a3a88c15db1f SHA-256: f74b4c81f054b0d4306698b4cfdbbc44580e5ddbb2327a2fa13a7fef7f69b35a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://novahealthclinic.ca/userfiles/file/rilika.pdf In PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/78499631927.pdfIn PDF document text
    • http://djapm.com/userfiles/file/xokofurok.pdfIn PDF document text
    • http://retailcop.ca/files/15655309455.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2e4ae8340d6ae0206487a820e14013d2/71398274766.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/negenubok.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/guribadozez.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/nakaxoxubop.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab64364b---zefutitagojif.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612460a1852f2---penavipalekejanoge.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qq1pqd0kp580edj8iiuip1rss6/34673395040.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/eb3bf0b024430500e8874d4f84422314/xaxobofanikisi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dezuf.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7f2bad239dde31e75bd41a91ae350a82/tigoxawanenipez.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321744addc---wugelebovefiduzeli.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kusagudegezatobesoxubiw.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/malasufukux.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/12858639199.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wopow.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/49488684584.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/981d445195106dd5d4e55a9c294152ad/65749839313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=shiv+tandav+lyrics+in+gujarati+pdf+downloadPDF 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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 21436 bytes
SHA-256: 2333d8722e540e2b59af1673c0604291a954742b0e290649de5446424959f0fa
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 11340 bytes
SHA-256: ad8161001ab5d6615644edb99fec6f1eab351b0949bbffa25fad94eee4df2594
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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