Malicious PDF — malware analysis report

Static analysis result for SHA-256 be739a721e94c0a5…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 07:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5f8566e386afe223e45947334c50e0b SHA-1: 477d8aab25e2ed4cc0e25d432207031c7309d4a8 SHA-256: be739a721e94c0a5459e5511ee312aa4c3c06d3dfd63948ff1f145ef7fec01d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one identified as a compromised WordPress upload storage, and another on disposable hosting. These links likely serve as lures to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://gifarlcm.com/upfiles/editor/files/54019765071.pdf In PDF document text
    • http://chongros.com/userData/board/file/babumukeluva.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/84735019603.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/bitixeki.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3f8f30ff7---89614044131.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/xosudovesovuwugojowibu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/55895908368.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/85706869761.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/lapebifude.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/56786268265.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/57088874869.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/deleni.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/79350387248.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/sopibuvi.pdfIn PDF document text
    • http://xycrusher.com/d/files/7884394685.pdfIn PDF document text
    • http://yoron.net/up/files/doluvebujunafazapinasi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5a3b3953---34416652728.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/70202161047.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506cd10e004---54957679796.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/61301118192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=recover+data+from+formatted+phonePDF 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_off0000ad48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55F 10692 bytes
SHA-256: 4ed5b322d60bb60b8f51a441d3aaadc4df3c1a58729236ef1564e094a3353edf
font_02_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 17036 bytes
SHA-256: 7e5167685aeede4e65ef15f206e485f81f22cbdd4f6a140fad818285cf99d6f8