Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab48693e7ec59d70…

MALICIOUS

PDF

98.9 KB Created: 2021-09-04 21:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c60d00240dcea126d4bb837347b056e9 SHA-1: 287162983419d2aca77bbccff8e4a09d67c5b73e SHA-256: ab48693e7ec59d70943848899d8fce083b91b79201602ef49b1594a888d8ee5d
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 external websites. Several of these URLs are identified as link farms hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://younewstoday.com/task/userimages/file/bafezuxugujeremitan.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/87201067179.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/15825734830.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/pekexaloxabakowo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wowumenazetiwijivipej.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/sotuwoxoberogit.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a493558e9---41508113339.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/787059b0e173f643a317eb62c2430849/fefepaxefijisitida.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/misunutogutojiluvobo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df28f544a5---54188181344.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xabud.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/63693944654.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a72f811bf7---96008630754.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a9d0514bbe1741ec497df35fae5953a2/wopili.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28cde477b---rutobubup.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cec748b6aae---wukojupurexememaf.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/fegolel.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/valiromuwejegutotuno.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/74577498149.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/kevukasovudupefa.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/jokavid.pdfIn PDF document text
    • http://vinmexindia.com/uploads/96001332678.pdfIn PDF document text
    • http://xycrusher.com/d/files/1779068821.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d4e41f976---geduvipedadisu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e3497c8e5---vuvuguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=integration+substitution+method+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 21476 bytes
SHA-256: 51616101fb908723d88c09bca543f475c3861b396b8a07ba0601cf0c1e0cbaed
font_02_sfnt_off00014d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D56 16416 bytes
SHA-256: 967c3c3c5beb4e771221bbb75dae0127eba6c2319b2eea4afa296455ab9d1783
font_03_sfnt_off00016411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16411 11088 bytes
SHA-256: bbd3c693dae295feb153cd3d423518b6281407b4909a76555ee24d56437ead04

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