Malicious PDF — malware analysis report

Static analysis result for SHA-256 a778d4490fccfcef…

MALICIOUS

PDF

92.7 KB Created: 2021-06-25 17:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85b7a72e2f0b8a9fcf023b4fec64203a SHA-1: 373e3db02494e28b969b5fea212e78e4b89463c5 SHA-256: a778d4490fccfcef1424f1e168180edb3a9d20d213ee94734da7a857eb977efb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vinamex.info/uploads/news_file/11769607020.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/c8ektf8dderuktjmsb20u8hebv/35733508563.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c138eb3e6b9---50524653351.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed97d1dae---6103339587.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ktppi06hj1mi03pju24psfveo0/bofazosaguvexufemeguget.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/kumifazitimupudesa.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/90106697831.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1529c69329eef46db71e605235896f7a/wonapedivukopef.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/92363145815.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/dimalolida.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c6aa49f---74220604924.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/binari.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0b1b57f723dcb087054c61e2c217f0c5/suzijisalef.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gi0hfun4houpfpr0io4ql278u4/webutedufabaluxuwu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/29826660551.pdfIn PDF document text
    • https://majubesar.info/contents//files/73036408533.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kuvatoxivirumoziw.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hnbumln921eqe2t2ithghv7a60/boxafaxubipifubagazubade.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1f25c7ed8369408491f64a1eab343a58/36600612570.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043bc7c44d---luxezofula.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503062425.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ee7f944acacb554ac036ee21af66e385/25746992779.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f50157e7---6377764083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=catmouse+not+working+on+firestickPDF 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_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 10944 bytes
SHA-256: bdc800b316467422421f3699c69a9c55cf0a908b39e1d3945fba9d8ffae43da3
font_01_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 17564 bytes
SHA-256: d9eebe5143080182e60a4fc903dbc3217fd3075045bfb4d25e6720e3ce466ea1
font_02_sfnt_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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