Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef9e7253a5a67a7…

MALICIOUS

PDF

75.5 KB Created: 2021-07-07 01:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f339c29939a981e4fd64cf173509da9 SHA-1: 137ac9dde320477ac141afc50c03b9769202a8e6 SHA-256: 6ef9e7253a5a67a7ad56f020cce2ec9dd434e07f70655e189453fee543454418
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious or phishing content, consistent with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11f1545604---datujobixenobovufav.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7bb8231b---zabapemizimetuwolili.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/lagegen.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160796e893d2cd---86882658185.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33f807c81---50861904436.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/35363135693.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/62402233223.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/30182897966.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cdaaf114ae1c9904ee3fff9a97fa25b3/41681496595.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vkhr2o4kh7v7t4e1moe4d677rg/51381673458.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/24028997402.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pigagadidogawodipomur.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/pofokopexope.pdfIn PDF document text
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/xonotovefoxulezarakigexur.pdfIn PDF document text
    • http://splogservice.ru/content/file/tefizosuremeleta.pdfIn PDF document text
    • https://kopari.hu/files/file/11567586292.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c065cc893---12098920006.pdfIn PDF document text
    • https://migger.dk/userimages/file/2827061512.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e4ca9062917ae0fd8be5bb2377ef0315/34275962682.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/jigogekugufedesovu.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/xafarupidafe.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77df8803b---wenunofonilopaguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=taxi+driver+full+movie+online+with+english+subtitlesPDF 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_off0000bfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 18344 bytes
SHA-256: 7787eb6704fe37609775077da3514e764f8d4cf5394aae4e476f4287cea3ec69
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 11260 bytes
SHA-256: a01bd0f46856b6ecf8a75399e26e1ced846c0d32f03553d1d38a886d34b4499a

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