Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ad03f234add6c0…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 03:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dbf01fa8b06f6b1188f318bf53c23ed SHA-1: 51da125c7699df49e6a5978a0463d5540d181fc4 SHA-256: 27ad03f234add6c0652813cbb377396f5d1ea1c0487d2c26cf97e304b7bde12e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious sites. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://dnepropress.net/files/file/satoze.pdf In PDF document text
    • http://hlqh.net/userfiles/file/20210818143500_1912726922.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7b5a8e58547b1e0e44488e3fe9c968bd/13966050816.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/dokuwuxoxuwumedufijelad.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f666936bb25---30866310064.pdfIn PDF document text
    • http://sbkf.org/files/files/57835561200.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/86989457027.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/mk9m566qqeamofqhf5sus2sbr4/34349497988.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7be00451---kokolegevagamiribedad.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aead6f301---8773759127.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a151fe70b4a3d02ad252bd1bfdf5dd61/71926141038.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jazopoketegekap.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/80534797200.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/moo7ugk3uo41plgnc0bdkktaks/11741450212.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2731b3ad---bukoridi.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/mipate.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a375549402---kejikejinumavabib.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/rikakivoxojadepikuperux.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/zegewebujefenonurunij.pdfIn PDF document text
    • https://luminex.pl/upload/file/31401841060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=heterodyne+frequency+meter+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 18964 bytes
SHA-256: 3f4273b95a3d40910435b58b6a38e7fa7558d7417fd330e0cf5222b70d00ef66
font_02_sfnt_off00014c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C57 10664 bytes
SHA-256: 6ef9f1bd7e0a42caef72fcdcee75955bc9d8c0f321ca9adcf7a598f76043250a

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