Malicious PDF — malware analysis report

Static analysis result for SHA-256 82657de153dea9bc…

MALICIOUS

PDF

100.8 KB Created: 2021-06-27 15:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4305974d94c2dac5d0fe6901bf0d711f SHA-1: fad8fc54db3c6f1e841b638814333c45a1cc021f SHA-256: 82657de153dea9bc7012d8906f459c2e2c32a1032b04d51f714bf58c62c00d17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://bda.ch/ckfinder/userfiles/files/76773046029.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43ba86d40---venipuzuk.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3b8e39ea---lepugumanovot.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/dodevutojufifiguneleniw.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77f64954b---befajur.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/75be6243e1e4147962cae7f03a8c124b/giniwijuvugemegilinet.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/rutomejifijizaf.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4600c54b0df14f6c15b84012632c6e2c/defeselogu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d900e20af0---87994094142.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c246ee600f0---bakidisoxedisafigi.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/12653553158.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3a76d475817c46f75d5e8aeb01f8d0a5/13125524979.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/74379904933.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b13bb53feba---18460286682.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/pinaxanasofajopovexisas.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf2ebb941---20946948165.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f3d4348e---letew.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c90359545---fuselozinu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/wegapiligob.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c892e7b7b0---37335553321.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/kekiwoxe.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a24ef0f36d0c69b093c27164107db10/28054454359.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7709e48e2---94961697070.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/lugodafejedeliguguvavipug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sole+reason+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010793.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10793 19264 bytes
SHA-256: 960b56b47a1c81bed202131b3d57c72950fe8ce51757c9ea12f1cb6a7156d5eb
font_00_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 10428 bytes
SHA-256: 6c7c9fbac3d023c21d982773f384930959bfa6fb5ed8a3bfb2b8dbc2c3ea105d
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC2 2388 bytes
SHA-256: 56c523a411a76373f396d5b9c3bd4227199156e3718957da8297c4cce0d03b05
font_04_sfnt_off00014a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1B 23716 bytes
SHA-256: 94a864c7bf4018a4a0554bb6d0503e705da11477e6e7f8775f06cdad386cc0bb

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