Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa9ba0553ab4739…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 07:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f781c48888a1c9c5e378bdad0ffce156 SHA-1: ec480c7d20c913c71909544a33fab67329613b10 SHA-256: 5aa9ba0553ab47392f9f6ef0d142da88161b885f228eedb1c7db583730446522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a deliberate attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=free+250+instagram+followers PDF link annotation
    • http://bet-balance.com/userfiles/file/45490391148.pdfIn PDF document text
    • http://pk.mo/userfiles/file/81732274397.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/37415830004.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///doxakazebebebato.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/bimefitozelajirigudu.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/dujerovijatatesagojepol.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/79951492179.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/59980353431.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/63548825664.pdfIn PDF document text
    • http://iviltra.lt/images/files/60981365000.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/20302589002.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3e34c9509f96a71f6a1e319a8a5ca2/tarone.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2723b5be6---80916287678.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210913080735.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/55536829634.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/fukafopaxipoz.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/boxomevovirepulekanilujo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d231f5a6ae---41561539174.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vefozi.pdfIn PDF document text
    • http://ladna.pl/user_images/file/pelozogowuje.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/92837541290.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF9 10996 bytes
SHA-256: 50ab2a4ed2c19e819edfc9ca55b2b0607dc63ef0728e8c03f0f2e39b7475f521
font_01_sfnt_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 16272 bytes
SHA-256: 0f81e12eda049332d28ec3b84110d56aea70ea2fb1a381c975435db5c6ca8d97
font_02_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1