Malicious PDF — malware analysis report

Static analysis result for SHA-256 3443d2bde68890ca…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 22:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2738b2c91a16c9342150f77e1e56c16 SHA-1: 07744f2abc32541e6b52f27b953382eb738248c1 SHA-256: 3443d2bde68890ca9a21201a8c7f807871ecc85f9ef28ccf60fb3fd1eee6d46f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, particularly those associated with link farms and compromised CMS uploads, suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://thibangoto.com/app/webroot/uploads/files/33777709668.pdf In PDF document text
    • https://led7.ru/file/17185699936.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/diximefife.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/196b35a55d73e462b981e44d6d97ef6b/bepofef.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e863837c437---vaxugabopigofoseguka.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/v39dvp9uab1j5bltt38588as26/30009340689.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/vadebop.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160db69c58d9be---lasokewevujuwelanofoj.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/831831617.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/29223516471.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/fosiw.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/nedewiwowupuzepes.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/50199644104.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/bukiketoloxibuse.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/82140646953.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/afgb27rk8aplg12k4c9g2m0jg5/vojemotekasazevexu.pdfIn PDF document text
    • http://imi.vc/upload/files/72023304243.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e823cb397---jolaseti.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/gezito.pdfIn PDF document text
    • http://www.corpeverest.com/ckfinder/userfiles/files/fuvulegadesekatubatuxik.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6abd0334---68029882280.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/83698208551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=english+book+for+pre+intermediate+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/680fc9df3b97ccf7232b7a1e949dec4a/gifus.pdfIn PDF document text
    • 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_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 16800 bytes
SHA-256: e6b7baf799e7b88b599b9e9fa6cb3ae26e7a550e5348c3ec4cb2f425eea05d95
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 11160 bytes
SHA-256: 4a2eadde4bf6f76f541be9e7887e9d4bc8ce04f86677cd794b4abdda43599bcc

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