Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bbf416f39bf65e…

MALICIOUS

PDF

111.1 KB Created: 2021-06-28 10:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc69fcd4bb34f4cb0eefcf07b2e7b3c5 SHA-1: 9e437effd7db9510115a522a4717ed299630d2ab SHA-256: 22bbf416f39bf65eccf70e8edcada1920d925e73bf7a0ad36e5906a64dab61ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised Content Management System (CMS) upload directories. The presence of these links suggests an attempt to direct users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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 http://asja-doll.ru/userfiles/file/5752392194.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a8481c51f6e---73066851986.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076902a00839---29626888432.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c486910e---78645679666.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/16e65509d9b56be7ad5d0462f4c116c4/65762178229.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/62453127271.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/23rquqbnsijcq4uphk9lhbpq1j/vujifowokufoketadagexuban.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735977cfb2a---31858206192.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cmv636sc6jk4q8rfni07p61in2/bivut.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rao3vt3qaqjrti0is16c3pqeqj/98322526649.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea1517b2e---wudojolenujudokofalajen.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975a42d21ad---babesuvumemigutadiremagum.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89de9ebe7d---pekawurexosid.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/87006292354.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/98209722197.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fvl1313cjphglcmhvc4bf0p2gn/42990461909.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/woxonuwegepetunifufenavu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af75b02164c2d53807c63bd7f9f9f99b/31812487982.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c146302161014c3811fc37902562a2b6/zuviri.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0784bfc4366dd96c63876dadc9b0aa5e/99828265035.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/60462613572.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/57660132112.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/dotoxetuzofubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=brown+tiny+poodlePDF 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_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 16688 bytes
SHA-256: f1619863a6da18a0a8ecf3345fae7e9f6e1f09b992142bee9f4f8883b2cd9989
font_01_sfnt_off00016330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B47 10308 bytes
SHA-256: de23ca8ad9ff4c87826e2ef5bd23e1175b111d9133d15f9b83c1d06bc535587e
font_03_sfnt_off000192aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192AA 18220 bytes
SHA-256: b378d2fde058997ad0b079b4cba456e593101029703b9a98be61ec39f73b6e35

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