Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c5994c8b1e3f44…

MALICIOUS

PDF

74.0 KB Created: 2021-09-22 13:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09bf70ce3ce7757cb925b2d8dafca5ae SHA-1: 6b2f921c7e4267d3e81d4a71aac6c85b63e06da1 SHA-256: a3c5994c8b1e3f4403946f063d6be0a10c3b543e0f1868ee283ac8176913d5c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116129de4e---gopekikukaligufizazukuzi.pdf
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/47938452033.pdf
    • http://sisparts.pl/zdjecia/fck/file/57791174338.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jum28ldp06ed1cdkno1ve5a4t1/piwifazizeve.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/pitesokobut.pdf
    • https://ozora.schaffsen.com/contents/file/61604887462.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/65064888414.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/vabixoz.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613856fced3e6---24123189883.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/61017978475.pdf
    • http://jedwines.com/cmsCart/upload/file/14557095792.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/nesetukekum.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/gibufalo.pdf
    • http://clubselectionvoyages.com/images/file/61743904888.pdf
    • http://ccsilver.kr/files/fckeditor/file/170733233661483e6196ba1.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/memajelukozojazidasizezi.pdf
    • http://moestuinwebshop.nl/userfiles/file/3650199036.pdf
    • http://kpdb.org/userfiles/files/zoraruxeto.pdf
    • http://moriefrusca.com/userfiles/files/mikurav.pdf
    • https://danielstrehlau.com/userfiles/file/moniguzuvip.pdf
    • https://educhina.mn/editor/files/runuzipizedawumamesuman.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd64f47a0e---76236716045.pdf
    • http://goodlife88.com/uploads/files/feturomubasololimune.pdf
    • http://zhizhencn.com/filespath/files/20210911021617.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dawapisanalojaba.pdf
    • http://unionasset.net/file_upload/spaw_upload/file/20210902014034.pdf
    • http://hlqh.net/userfiles/file/20210916024909_1920521104.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=run+python+script+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c079.bin
bbd9c28fbfd159d243410f31317a00bd68799f0460bfb684f488e6d8fe48680e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 10692 bytes
font_01_sfnt_off0000d906.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
font_02_sfnt_off0000f118.bin
c1168f24eaf838030b2ab7c5814f355952dce69a1cd781cb30c74438355358e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16044 bytes