Malicious PDF — malware analysis report

Static analysis result for SHA-256 751546ab893918a6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 10:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47f1b67b1bfa93e2693e02d0f974a9de SHA-1: 7ce5f176748e57c44f37c5641a45107d7bbd8745 SHA-256: 751546ab893918a6ac4317f2a408f437bfab8a899d9b2bcf34743bc028330885
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The embedded links point to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b96gkcjck0oisidqck22h1b290/xetanuruxalelabalo.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/bukuforos.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4233cbd96c---xamipe.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/31784384961.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/g4agn1hqssv919a8kbdanuc330/nadajufalevoniro.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd48bd98c5---nodovasotedumabag.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/61417458808.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210804161435.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/91158064434.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/runeliropetofakuw.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c8c49a31cb00410a692e7f204e07798c/fitilafez.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/tbp9bq6fhpttqk8290lfmhuvcs/5033440096.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/36863741136.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/48882432428.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210704202008.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/xokekobodewajokedotawaz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d75b0eb85---94381261254.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/46497485604.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68e0e316c---fefunalogenox.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/lupazirewupujilawuvoven.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9cee008---kokabuk.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s38fnnb7h7la522maqndp183pt/saxagupuw.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf766ad38---50748240653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=compulsory+meaning+in+bengaliPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f322.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF322 16668 bytes
SHA-256: 6c00ceac780d3f422ddef1c614ceb0fce5064fd832f35bc1808fe21ba17941ab
font_00_sfnt_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 15840 bytes
SHA-256: 72ca4a942d688a8a9a4cc1c18c42754ab6e615e57a5a30218e3d6c0f13d57bff
font_01_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10880 bytes
SHA-256: 48a0cac6824c1cd14961762caec08ced0ba0192036f2cffabe9aba3c8f12d782

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