Malicious PDF — malware analysis report

Static analysis result for SHA-256 e904f172fcdf3560…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cf1ad6e2b21db73830266af3e3b2e0f SHA-1: e2576a79eaa56a710b110b2f71f978d275278b53 SHA-256: e904f172fcdf356035d62ee8befb63d46c8494fec88261666e3c336ef8cb701c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to websites that appear to be compromised, including WordPress upload storage. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://autavrabek.cz/obrazky/file/dejutonove.pdf In PDF document text
    • https://dcmheavyequipment.com/admin/images/file/64151674716.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/35897358633.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l8daicv93dn48lnol8e0lhmvn0/84825535909.pdfIn PDF document text
    • http://prosquash.by/data/8989803810.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3aa48120d---49933831652.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/8419072121.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/lewonijavipikibatedunuke.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bn9goi9hb8ll384hjj99r16pm0/40012623312.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/39335896ab74d2d3a723b93829f4377e/vafawotejatijaduvukote.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e63df6e0---lopamide.pdfIn PDF document text
    • http://gabortech.comadmin/file/gexedim.pdfIn PDF document text
    • http://alcantara.cz/data/file/wavokagudubisu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/34529087531.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/58491513815.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210824144523.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8g0r160uu9pauloe9utfiacvl7/rurozusigenizo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4c974d48---24096027238.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/72633767696.pdfIn PDF document text
    • https://polaria.cz/images/file/31071990397.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/stjjuals0shdo8ovtber1tcgg2/ligukilenadegezikalebeg.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0c822730---26983010273.pdfIn PDF document text
    • http://palami.by/images/file/tibapatinunibabekitu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/54283737465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=marcato+atlas+150+manual+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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 10956 bytes
SHA-256: af2aa11ffcc94bb3e056655dad4aeb8a7ab97c36398c48777642b1f9aa5ca5d0
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 18824 bytes
SHA-256: 77f39715afce7061910fdb975226babcd415260465580f68a2f64c6b21f489f2