Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3270dc8a15105d9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 17:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04087256adfd52848fc9524a3f4070dd SHA-1: fe93aafedb19587a494e7a6637b3f1064c40a2b7 SHA-256: f3270dc8a15105d98647c65ded6cb44ed531cc0db6357ba532654b0add197efe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the heuristic firings related to link farms and external URIs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=converter+pdf+em+word+e+editar+online PDF link annotation
    • https://baohohoanglong.com/userfiles/file/nivogute.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bugebaputenu.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/gonuzixudotetimupikow.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32005514392.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/70142830550.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/35095231615.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/vufufekimewujivejep.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/nezinidi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65983b91d---xifirefevugel.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc07c08cc---49440751162.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/zurebolomidefo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610896e6d69ca---fogobuxamofijepasuladuvox.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/kepinogumuxotabimomu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070783aa7db1---memadonon.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/wisorojesikozikiwase.pdfIn PDF document text
    • https://migger.dk/userimages/file/7950495543.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/24e6bad918b953a74c8871c300671107/64408273192.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/noxaxobis.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/zowawu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f591783---nuvawaf.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/76170190546.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/407c611272d0d75ce9c7436e99fecf8a/zirazotupob.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/bixafisapulujogudapu.pdfIn PDF document text
    • 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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 18100 bytes
SHA-256: 0344c9d82bc29da515d28526cf838d8497379d162706f31b917285ef2bd0c475
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 10672 bytes
SHA-256: ecd37a6d16b99c5df10ee57d390649df701e16bc5bcb00e0a505bd15554e9bac
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1