Malicious PDF — malware analysis report

Static analysis result for SHA-256 2566e84737bb4cdb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 04:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01e62c777c65255e7274f6414cc81586 SHA-1: 690e4168b178035e1a995f4dafc2ea86d915e8ee SHA-256: 2566e84737bb4cdb58963a37f1dc7414f4d64088e92fad17e831b19c75752cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=giochi+di+ruolo+android+gratis+italiano PDF link annotation
    • http://koddous.com/userfiles/file/98614443854.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/35518320116.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/48822738254.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd0e012bf---46565899985.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotedomodole.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/97338130398.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/dokalisopewodupozezafede.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/zezuvorisimaru.pdfIn PDF document text
    • http://citra.cl/userfiles/file/92815659005.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/kasetonotomafipome.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/31685789348.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4c2c1298---28573873725.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jobofufesizumekenup.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/keporokumipadozixava.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/90731827547.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/mesorologosokeko.pdfIn PDF document text
    • https://phm.vn/upload/files/nifegabe.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/92810520936.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/nugewo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3e0333719b513b659773cf84245f350b/jerajatovafezu.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/fewalepikexesufujokiti.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/52911241808.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nutet.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/baxazibozamefuwufirev.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_off0000c41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10656 bytes
SHA-256: a5eff0903788f5fddd965ffedff7ef534ba4b14babbfeef97dac8cd2a7a99576
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 16884 bytes
SHA-256: 9a25d8a64f973968fe7c03240f67a2a594a5b3db9d47d65dd773b3bb1a5b3552

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