Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7a39fb2bebbc55…

MALICIOUS

PDF

100.9 KB Created: 2021-09-06 10:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7363ba51254b7c5b014513372399a4f2 SHA-1: 4f64f49691ee233108927f71b5a4765d94bc2be1 SHA-256: 7a7a39fb2bebbc553229550ec91bc1799e772b7a974c43faa6da409128e0d2d2
164 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 high likelihood of malicious intent. It contains numerous links hosted on compromised websites, likely serving as a link farm to direct users to malicious content or further downloads. The presence of these links and the overall structure suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c076612242a---46924760015.pdf In PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/af1d913211d2918560d8e975736a826a/simunazejoson.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vival.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/65497947308.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rmphkdicg5hj9aq3pmilk07lmn/wonilazugeza.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/suxemakawurozigak.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/70266585204.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/lapaw.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/7908834404.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/48414252947.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/52992701325.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0094a7cdf---getemukamakos.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/dunusijigopotegaxav.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210811051015.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/92432130160.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f0a09cf3---lilomojum.pdfIn PDF document text
    • http://tfforming.ru/d/files/lesanezubogapav.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/48669424960.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a283299d5df---ginagebidatopupavo.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/gebitugenarik.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/60af9a31fa4090baee137461530ec5ef/96494508358.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/90f3fb52f5ab5de694568f916df0da6b/6013570001.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/fekojizapotiwapavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=blossoms+of+the+savannah+pdf+downloadPDF 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_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 19080 bytes
SHA-256: c69789bf712e17855c51525b2fb8f4622220eafe745b0879fb9d5e0461c6d3a9
font_01_sfnt_off00015513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2A 10776 bytes
SHA-256: 456c0928ccc52b725228c161303010fc25802df17da3e364a611f8f240bbdb2a

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