Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a116108e5918d80…

MALICIOUS

PDF

191.3 KB Created: 2021-09-08 11:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bcdb4b09f351ca55ace6f06fa21e738d SHA-1: b51bec57e32dc0c94f3adff9ea24d4d34ce15eba SHA-256: 7a116108e5918d809a4a67784767f77987d3f07c4ba3cf0c167eaab486509775
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbc0c1437b---4617638102.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/59cf435aba1aa696c7b84b8fc78270de/4920482535.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/12994735682.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/xobidafoguvigewofawuranig.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9m6rp2pc9if308u46slqpina59/86510784440.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/43344559384.pdfIn PDF document text
    • https://impresa-valli.it/file/voxiruliwunekibami.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090878b59605---93392914059.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/dotinibavevujemepov.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc22d467ee---dovezid.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd55185c5af---jigetofeviva.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fcaedc0aa---2564460305.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8bcb9832---jilafifizotivewosatinub.pdfIn PDF document text
    • http://kasargod.net/uploads/file/bipon.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087820845b43---42312077567.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/gofetexi.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/wakovagiruzujiwuluxejude.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5456bf341c---fezefisilijosatugowuxel.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/pukazudeke.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/lezekaxil.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/nekik.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/5809001231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+makalah+tentang+bahaya+narkobaPDF 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_off0002877e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2877E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00029f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F90 20720 bytes
SHA-256: b7ff087691f50691def941371ec6929c2fdd5065f05a24c4bb29e461d360b676
font_02_sfnt_off0002d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D622 10888 bytes
SHA-256: 6a4cbce610ba17bc64d3a20411a7b7833300c9ae8b00821babaf27dc748fe7fe

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