Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f62865ce54a41b3…

MALICIOUS

PDF

139.8 KB Created: 2021-06-28 20:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ae2d02b5433f62ffb2d5d0c1d64014f3 SHA-1: 5abd5eadf87c5c6a9385e02090d0167d2d7dd91a SHA-256: 7f62865ce54a41b32279a09c2fb2838db6853061863b865371d89ebdf4e6f724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

Heuristics 6

  • 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 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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ffb85fd51fb50072964d606c7f35fda7/37974779218.pdf In PDF document text
    • http://goteneplast.se/files/images/file/45153530551.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/96392501580.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083170f5a1ef---76371728173.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf82956a9e3---giniwez.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/77051bc9a3dd883a76f67c769e7b0a3e/vepipetowab.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/munered.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/88155090529.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j624anf52p78o6uuokdj029967/38940449848.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d058ec15---37860490821.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1350b027---52666414489.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/nugujidufaf.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dazusabatufu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4c18323a---medikiwomasulesakuwi.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/51087278815.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5780bee8---dugaxexogazepovijelofo.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/miruwug.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021641445453998.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a2288feee808fcceda5b7ed71c9f9815/ligudurugidikebuvepanarot.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/wokisokoxolovopipabinokaj.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc03ab719c---89962823742.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf81638d3---garovesakafesufevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=superscript+before+or+after+periodPDF 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_off00018e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A635 10780 bytes
SHA-256: 3009b02b4f7ee99b2a194cc68b4dfdeb94d721087ed2e51d24a6bb30c49425fe
font_02_sfnt_off0001beed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEED 16464 bytes
SHA-256: fbadc68d95af071b607de8d45b29e333a0b81a2e2dd4151ebc995f3390731e48
font_03_sfnt_off0001d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5BD 32208 bytes
SHA-256: c071e5e48bbc05a506e74d792ffe2412d664f654cb2906a5d964b003e9494e1e

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