Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdc695075629d80…

MALICIOUS

PDF

111.1 KB Created: 2021-09-07 02:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a412dc08a30eca9485e4a01dbb8a6983 SHA-1: a8eeefebeff6f9cecafe4d6c379a716ff7f2fcc9 SHA-256: 0cdc695075629d8013679f0f2c5abe282328a71890acb9fa1388b77ef4671939
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://matchonusa.com/uploads/files/59522340899.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b82dd887749e469d5f49add960de5825/30218150920.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/57f11c7511cf884192482b906f4198bd/lilemogupemigamijis.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/vanugazewosanutat.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/mepawidabuju.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/gosemutel.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16110dc2e78549---31185257416.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b71cbbd9d---94296819177.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/2897it5equ8407fj1383ugeco1/13434295472.pdfIn PDF document text
    • http://ledson.ru/upload_picture/xemuberizopigapepu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/o39rn9d8icmv9s61788ti845go/risumijusazutak.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/31234411640.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a639736be2---jozuwex.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d80bcf58a657f3bb6e03cedade81c4d5/xidakajudafawanugiko.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e92dca76c---loneguvurazijaniguxakogew.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/k28jeobvl08ng74nfar1gh42q6/54348856254.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/185706117c572325a1a7ed4e3e91c8dd/xetenokerebaro.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/bivosusogixako.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/zisexepewira.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/17f36b340087c22fffdb8d2b2dfd79b6/borowalofodo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/bazomaju.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c055c3707b196f28264f3a942fd0ae20/veneloxolurugififax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=elektor+formant+manualPDF 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_off00014ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000164fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FC 10292 bytes
SHA-256: 3a43790bf1b94e02298a824b719ca740811a21c6f184e191ce186a6c5e4e2f62
font_02_sfnt_off00017c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C23 18684 bytes
SHA-256: 18e764ff435295f72f59c3bb7b9afa1755f3ed636436ca03814418eb3cac1b95

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