Malicious PDF — malware analysis report

Static analysis result for SHA-256 110bb306de2e185c…

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 15:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5db362ec29c1c5feb5c447fae6351b5b SHA-1: e4f590e01622fad273f3933975a977bb6d753cfc SHA-256: 110bb306de2e185c3b80277800eb88974f3407d738f56ff0f54c0b119cf6eac2
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic firings indicate malformed streams and links to compromised CMS uploads, reinforcing the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ketchas.ru/uplcv?utm_term=how+to+reset+armitron+wr165+watch PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0833ea4c---70282949925.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea102777ae---kuguwamobixekunuw.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/60848985925.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/vadago.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vitelelo.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/mofoxebumaf.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/50235346420.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff797c697---kovewiz.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2c096e9459871deadcf7ac84ef4c5f69/fopilanisexerexojikavikam.pdfIn PDF document text
    • http://anupbolivia.com/images/files/68734279745.pdfIn PDF document text
    • http://metallpress.info/files/kilarawaruzusofudipulamu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/pivufukirumusirekimerezo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfec90204---banusedeniwemaxibojafizir.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c5d9a36b1de2ab09f0371e6c0c7a9f6e/33736430445.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb01462a1---86944325699.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/33519025164.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a352110b0c8---85463334152.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/papeperivexelokubijene.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f50c210b2---18092872966.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/41926963105.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/liv2c34ib0nkatj675b4hbm0lr/vibobevojaridofakawijili.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d73cfa28ed5---89618602313.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f767a4f1c---15743028107.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/ditapakirazuwisofe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/totegodoribif.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_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 10880 bytes
SHA-256: ee6c64bd887f8e5427a8188d484c992c299a47ec508a1f600b86585680d9ac79
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 16968 bytes
SHA-256: d454de95a4e0bd1dd01324cbaa981e72e8b6ff45668ba1d8d16bd256d6666ef3

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