Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b730f5f01036c8…

MALICIOUS

PDF

76.8 KB Created: 2021-06-27 05:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21ee11831e48b5a3b5f17cc1b61d4cf8 SHA-1: de78410d5b425ee17b661e0de1b26de6d48a4ea4 SHA-256: 40b730f5f01036c8753fe3a60e4e2d6c392591c2e64f7de4391e24c3fe1b30ba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The presence of numerous URLs, many hosted on compromised WordPress sites, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da51c20f2---96830224418.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5e132103254f7d14630f3db71b1fd542/zomusogosirup.pdf
    • http://cnex.cc/images/blog//file/gavurog.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e0772b6f---gogarukifisig.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/bp6dvcn81vrc7n0hf45jvu7k96/93920106091.pdf
    • https://dcoderesearch.com/uploads/63012818490.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec61069006---47807108306.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d078a03656---39901829141.pdf
    • http://szzxwx.com/Upload/Upload/file/2021618548162426.pdf
    • https://airshow-bg.com/file/13442948221.pdf
    • https://netshopnepal.com/userfiles/file/26324496626.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5d18ae14777152377ef3089466efb900/41033046193.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ed1pq9a24oml0l3qvjbgn0ult3/gedefunomazeweso.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/88d8d56cb9389b5df3a482e29287404a/69342671298.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/b7id4b3ts1g8k8ecor1h2kdmv0/temele.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbd2b77d77---xafasozinomizajenogarapa.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896b2a1f6c7---finoravibanu.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3edcde224b82f03c834fe7d94e9b24f1/patisezigenuja.pdf
    • http://onnetsolution.in/userfiles/file/rabixu.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a8f8116070bfd65ed52797219050325f/rarolivunevelagowuku.pdf
    • https://avvocatoboretti.it/file/44541784865.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/mljfc4j2bkkab4qa6nh4to399j/mebeberodepuro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=steven+fusion+with+connie
    • 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_off0000ca9d.bin
1ef622bf2b110026e08547f88ecfcbca920caa6de3f9510a5220895d311df1cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 16524 bytes
font_01_sfnt_off0000f4e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 16792 bytes
font_02_sfnt_off00010cfe.bin
ac8a805fb95166b3ffa53708a4ea24f5ab23e7df940dd38ba2fc379b984f0a35
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10452 bytes