Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a061b21b097d666…

MALICIOUS

PDF

82.8 KB Created: 2021-08-26 04:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 37942a504210600ba416b860ed43d358 SHA-1: 59025204ec7cf0554c72ad6c3c11eb3b6f8ac4d5 SHA-256: 5a061b21b097d6669c464e0f700493d54d3dc6bfcf06ae42bdee40f669eb547e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://unseenadventure.com/userfiles/file/29288647368.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160f682f740242---19347555578.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tilagurifofufobug.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5u8mned2j2bu938v2jul2ue54o/17024247656.pdfIn PDF document text
    • http://www.toptehnik.si/images/nixiriganegimapolanivaj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00bf9c225---lawid.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/47728615696.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/027b83631bc28d683f8842508d995242/57612442192.pdfIn PDF document text
    • https://tckontrola.hr/files/popukoredi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c348a31383f---genifenax.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/78731972864.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5d0dd86a97a3b7bf799f745dffc2c604/69578761865.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/46687990362.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/60888099075.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/163d064752cdb02179d1adebf5c1e998/velut.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pezuzutivakikubada.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/5701919495.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/14351343834.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/31636824989.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6824bc124---73529572900.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/5209019875.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2cobm2dfm624fo7k13iqa2i1q4/tedotamiwuvonufafawubol.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/dofikomalirogamovodupul.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/68875308975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=commonly+used+ace+inhibitorsPDF 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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16136 bytes
SHA-256: cd0d7914ff1055ed959b7fcbdb641859cd60236671600113a8c9b15fbde3d488
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 11020 bytes
SHA-256: a4f09fb193da73cc85f60eda4c8850d8a65161b758e5ae8a6d42867cbb592c50

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