Malicious PDF — malware analysis report

Static analysis result for SHA-256 612840ef637a5e5d…

MALICIOUS

PDF

83.6 KB Created: 2021-07-01 00:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 419467d6fe1b86314c9acabe6869d3b9 SHA-1: d6697d623796d52c493bda249d9934fe94043aa0 SHA-256: 612840ef637a5e5d0f58517aa720b997aa916665ac668b6c51579f1950dd1025
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's purpose is to deceive users with fake lottery or parcel delivery notifications to extract money or information. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://medvor.ru/uplcv?utm_term=house+md+streaming
    • http://apexibd.com/uploads/fck_uploads/file/jazowonuj.pdf
    • https://nada70.org/userfiles/file/62435306595.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8027e05e04836944f927488922de75e1/dililinifebevisuloperasuj.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/31858d87ab974198ea0b52803e0665c9/497189577.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883b151c944---vunanobisozojijuj.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bdad5d58a---67237085845.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gu7m1putjk5nsutpj7sb5qdfmc/91282951057.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/skrrc62cdg0hcabfq16rhkvkc2/xasabagatolamivabaguxo.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087af904a6a7---38996435040.pdf
    • https://aedwea.com/upload/foto/nexotuzuwigu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2178342038---57582781658.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/66727434181.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6f7ad588---48537418478.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/07548013a8d919a2eddd37f845321f3e/78169099562.pdf
    • https://soechi.net/userfiles/file/7439022156.pdf
    • http://lamachine.nl/userfiles/file/82921753989.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/eda903922bad95e3d51e1be3739ae088/95332416500.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2ufmdp0mg6rgs8nac31vfuj455/rumoxoriva.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/93478775318.pdf
    • http://chonburi33.com/userfiles/file/61958675106.pdf
    • http://shuimotongyuan.com/userfiles/file/11658489162.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff18e6a3d---57034647082.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d1a64adfcc2dce07a7bdbcff5fda91c2/pazezemigetiwujaboveta.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/notd5h3769ae8vtlh0m9m32hsf/rabonor.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/be114ff0a52e1a8dacfea9992589fb64/puvoxe.pdf
    • 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_off0000e231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 16792 bytes
font_01_sfnt_off0000fa48.bin
edc280df8cb4483c502affc1890e77b3085c8778d01e2d2f2aff26f24e80aa3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 10636 bytes
font_02_sfnt_off00011257.bin
330ac830e92578fad21c8c8187bfd0493f6a6744755b1c01a3a9b31580f2aa9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 18060 bytes