Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba1dbe520c701ce…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 23:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 172e660ea100ba6700e9c52552406a79 SHA-1: e21e597912ce10f7c05f4b6d16f60ce304bc2b3b SHA-256: aba1dbe520c701ce722155734969f06a9c4155a2f445ac9df00a1a3e33c92af3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to lure users to malicious sites. The ClamAV detection 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=xenoblade+chronicles+2+botw+quest+locations PDF link annotation
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc288888c2---supasunoje.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/wezawudabiwofamavat.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/82213377932.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/radeloduzakowakiwe.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/96457412159.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/nexetizafurotire.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d771f6af05---vovazonoza.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/65194800680.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/rebusupar.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hoqev9602ba2ed3ifrksh5ea2r/29534312751.pdfIn PDF document text
    • http://kgmda.com/upload/files/gipijegupemujelivuninuku.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a9e0f77f196be69d49b7c8e0d328b5d/gatodinoxerixowugotu.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/sewikejirupi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210530165300.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/roaq5u8qbosrnhj4tct5br64iq/5322885187.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/co6aq0em89oqlo793mbtgt6s1o/bosotipugugezoresozuve.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/h4o7opho3btpo8km7cnbig957n/46438851628.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccd205b54---15867617292.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/kokonawe.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4a5c37096d3cebd6536d2d50b5878b5b/83831752166.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v4ood9lu210q9ppstnc7uaddg2/17909163091.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/nefijulujuwuzojufaxuti.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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 18828 bytes
SHA-256: 162d47f70bd4a7797400ebc869ec21864a7486470420495688bb9de31606152d
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 11068 bytes
SHA-256: eb57d7845183540ad0f4569a826d996579aeea85e9c209d7cd4767a41a190d02
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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