Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53d3387556720aa…

MALICIOUS

PDF

90.5 KB Created: 2021-07-14 04:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ee154a0df414db0723a321c1446f745 SHA-1: 4f80fc74c2eaec97284dc8ce75582965369bd1d5 SHA-256: a53d3387556720aa3bbea8a83e87d6c402b13ef152026552a2f6358448045d1e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of multiple compromised links points to a distribution or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://phuongdonggolf.vn/app/webroot/uploads/files/79786350211.pdf In PDF document text
    • http://citadelcaralarms.com/userfiles/file/80019280351.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/96642372457.pdfIn PDF document text
    • https://advik.net/userfiles/file/jelifowuzunakoz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a0a3c2019434b50c4dd8114023b099c7/99738026744.pdfIn PDF document text
    • https://digireg.org/upload/jesemobagapide.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160704d54bca91---gusopurewudupusi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f2bc25e8---zujorunelalox.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0a20e44a---92837283535.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/16024806724.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e6f37136---gizagakujufokewazuxaj.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084063d10378---xupijasarivejuzujuwu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2kie3kubl6ckkromopra6e29qv/rapelexefabulapiwevaf.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/44af323be3b74ca2ebb6aa30de784cf6/56832473234.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80e05a224a---zotasevuludotokusikevawet.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074964b02890---62485404725.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe3b1cafc---tisapisuremo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f1d32d64---22491436686.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/074b9afacd0ec46e95390980f3bef91d/pojiwufojowawoxezopipixaw.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/kokivusizujubulef.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wusuterumejotopobab.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93nq3i1e0d0pmhlc8gbg1cgp4o/nogedulabebijofelalituli.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/48212209763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=civil+service+reviewer+with+answer+key+2020+pdf+free+downloadPDF 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_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 11348 bytes
SHA-256: 0cb26c201a04b1a8c74b4d4b2878fa615f951301574aaa13ede12c9205a66a74
font_02_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 16972 bytes
SHA-256: 1c7abef445fa75140ed1bf326c4777f0530c1d146b53105a7724df7e08ef5196

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