Malicious PDF — malware analysis report

Static analysis result for SHA-256 b309b9b96f4d4d2c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-27 18:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 103b75f473ff4ba97549bd0901eb9888 SHA-1: 47996a118697bd5511fa736e1dd6548e9778fa56 SHA-256: b309b9b96f4d4d2cb2062365512e4f08cce534b26a1c163f0cd026964b9b67ad
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://archism.ru/uplcv?utm_term=little+italy+pizza PDF link annotation
    • http://aotwresort.net/ckfinder/userfiles/files/tusitog.pdfIn PDF document text
    • http://africareview.in/userfiles/file/bovofanukaluremubamenev.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf56b148e---28088757704.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/38795190296.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/suvuf.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608956c3b22e4---37297593353.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/gjoaddhf6pbn8l6t87oifo07vd/6211998452.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/vusigogugutoxetoje.pdfIn PDF document text
    • https://artenika.pl/fck/file/vemefavizexe.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/mibuzi.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/xegovorenodadi.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/gisefawuwilapad.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/31659258683.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/62618772322.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/86994641098.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ddd888c50133341d8680d90dfeb4c0f0/zatubap.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/70584121085.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/10030071293.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2c9a67315c7e6d7cae51c2e9765f4c03/31530390327.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed69603c5---bovutodutuzasibenazam.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/n6o8mootk5mt5hq3haaj6nq4j2/miwariporulis.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/wogukevizumexovepe.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 1976 bytes
SHA-256: 54b1f2347037674596edeae0df16e46022513206be7e5249696b2cb4107831ac
font_01_sfnt_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 9884 bytes
SHA-256: 845e3237aeb236c9ee25e2bde9d33b46d54dffe7c0bb3cdeb0a832c0d9970522
font_02_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e
font_03_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 19816 bytes
SHA-256: 8878e1aa6362c4fb5ea74f8930e6b4595cf681ea666053703754d53af1f55868
font_04_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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