Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c1059f9eb0cc04…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 17:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79689a4d4477159744c386222d34e8c7 SHA-1: b5caee92c44f95d352bd1f34286d950f7a30d354 SHA-256: 98c1059f9eb0cc0440eb7011b8136b0fd352f2bacee3b6ceb92cb5949de66933
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it contains links to potentially malicious external sites. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs suggest the PDF is used to redirect users to compromised websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=apple+nano+3rd+generation+manual PDF link annotation
    • http://magogaralbamoble.com/galeria/files/pajimowenuxonanof.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/taxiwagalojemuve.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c705aed1a---30388075993.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b2b230d6---vaxidenikejatavate.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4b9fe3sokorqgnsghosrb6k7o0/kunewulijuk.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/83020603222.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/d8qmq5ned4jgsg4s5usraqirmt/1857712738.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/81061323235.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/ratumabivesujavu.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/86769867426.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/gapuzomabenerez.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cda60c69814cbef346b72ce40dfd5f23/59195915090.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08bf7ff2d---gizinapomumuf.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f787c4a7b3---95634355201.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086919c9a149---gubitubigufafi.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/xuwipizote.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/mududipaxujasi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9845c768dde7a0d7119145a69eab4538/97704794108.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/19142222086.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610a254dc99a8---xoxuwodopazadulifabo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca04861b9e1---36857311443.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/85623921678.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/d185c31ad29f7cf05c40366d81df59a5/josurabivotepi.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/12157085261.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe405819fb6---65238697523.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_off0000bcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBE 10820 bytes
SHA-256: d44411a6ac28be042eae736089f159b58ec13c30f259eca8432d94455cd2e785
font_01_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 16416 bytes
SHA-256: a7de4772a1bca4fe1bac5012a3195766306182d0292f8faea0805fc45237222b
font_02_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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