Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb1f6bef74945bb…

MALICIOUS

PDF

88.8 KB Created: 2021-08-20 10:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbf06c60863b70991ffb58968add99c4 SHA-1: ca5e8f0e22c09c63fc30b43e77bff5bf0c31a823 SHA-256: 8fb1f6bef74945bbfb56d35238b6b3af02a6f1e900b66323620d359ac67b18de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised 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 distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ahreco.com/uploads/news_file/mokonemuwurazuzox.pdf In PDF document text
    • https://juvelyrikoscentras.lt/Files/file/noderefow.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a8f1a70e1bb0cbaf9d64024dd91ec33e/rovimojebejudikixizuwedat.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/65357823098.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/telobisuxavexevax.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/24008137866.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087ab62920e---49164001467.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/minuvuzunilanojaxugixit.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/zufed.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f09d9653c2b0e061c46f8843f308b47b/86237881501.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zumamibowejufajuz.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/91189393402.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9b5b4705---53021244662.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/juvubulez.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9ccdf12d99943d929ead78f17deab831/91712171742.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/78543516866.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865499bd4b1---10093735370.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55d196f8f---3834440516.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/22482906987.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085641ec9b3a---79093166863.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/favitidesolu.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/8bafc3825e349e21c05f7aa36c7b941e/44172632943.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/gabumozenip.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/102704f3ddb7f3c7945ac95be41b0b81/napixebetoliwofarudu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n3mdut04cqcgfl7co3h3g87nsn/fapuvanurifopeforakonutof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=anime+all+stars+apkPDF 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
font_00_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 3620 bytes
SHA-256: 48e06457edafbfe48f0836d5b6ccde06f1025ee2835b938997a4218578268ed8
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 10368 bytes
SHA-256: 0ed36323be9de4f772ead22c3feec3ad384499559f3fd4faddf786cd3766bf4d
font_02_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 16968 bytes
SHA-256: b681ef6856bde6cd2032dab1d305b83b422eb54608c3820bf80d4ffc7aa57435
font_03_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1