Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f7892b8114c4bf…

MALICIOUS

PDF

109.5 KB Created: 2021-06-25 15:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a7f01fcd8453711e0c3dd60c4467fdc SHA-1: 745d0cb602dde8646d2e6c4dcea68ed62744300a SHA-256: 08f7892b8114c4bf9c639de3fc9f245785c4d8449256881e226d9abf725417ff
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious or compromised sites suggests an intent to redirect users to harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://mama-light.net/business_school/uploads/file/kigulowif.pdf In PDF document text
    • http://www.medicellbank.com/userfiles/files/lamum.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/9328814465.pdfIn PDF document text
    • https://actorconseil.com/files/file/91493005173.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wofikirorebifuso.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609061ff51754---74113606853.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/080ca3c9e438aa2519337e8390a5bca8/96535848297.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63908dead2---wojubojexuvukabilumore.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/26225844202.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66079d0a4---84546846977.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e7be0b817e193cfadfcf6cd9357f04b1/xadazoxedosi.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/baxirigexekonepimawitikuj.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gixibidelifewinutiga.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/80823874404.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/pefagedusurasazaganubej.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/22694921376.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7h49tv3vbjdeiq7ge3ep1784i3/gikuxulog.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/lezeborobubaxaritufidi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u199nqtl4i2p8iulln1e9ntev5/38205069608.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739c493e6fb---9212831613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=truckload+of+fill+dirt+for+sale+near+mePDF 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_off000145e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E7 18212 bytes
SHA-256: 896496fa0c49984057567dc0f011fb68b8900a61a3e45dbaaab5c6e7f7579cd6
font_01_sfnt_off00017610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E27 10792 bytes
SHA-256: f0b11b1771f526ad3968f14d94584eb1f0adc48e0bfc176fbbc24e16ab02de54