Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44731d3939db1a1…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 21:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61c5f006e1077e522af3f7cdb7292d02 SHA-1: 2d22ab1bd0392906a5a67cb97ba20b93dd94d415 SHA-256: c44731d3939db1a11846263181321aae72e82d8b8d481769f388bf14cbdeebe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, disguised with search terms like 'avengers movie free online'. This suggests a phishing or malware distribution campaign. ClamAV and ML classifiers confirm the malicious nature of the PDF. No scripts were extracted, but the link farm and compromised hosting indicate a clear intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=avengers+movie+free+online PDF link annotation
    • https://hijaulumut.com/contents/files/23199427996.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/54894992766.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/konukoribabenivetew.pdfIn PDF document text
    • http://savemaxint.com/files/file/gaderag.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/33430966070.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jijatexofutu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/819c8a0388c2f967c8242520dc33f496/jabajokuwizafuwavivudow.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/46831703935.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/14115583631.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/pamixevijinuvar.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613797d1b0409---40659612691.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/30918111130.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6gt7jn0p568tq3mvenbvi0vhhj/ropazi.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/zosutekaxunelijinejuzugun.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/zajuredabilafipolisa.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/duxoge.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0ff40394---pudalibokumikopane.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kamorogipowenanetujuti.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/moginozofitija.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/43530712112.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/getewovoj.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/wamar.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/jivekikijalojalelimituse.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_off0000af39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 15596 bytes
SHA-256: a41995d88dd6ac45bb753039571d069a5c0829607aa72a3cc74c3aed9b125c67
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10344 bytes
SHA-256: 36756333776e3b94c380db5e67012172e8021918e67fd788eeca36f2214903ce

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