Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f2a066886ddc0e…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 23:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65823377b11159739ea358444677ccbe SHA-1: cc0d66f031dac005a856ab50a98fff25763b487e SHA-256: d5f2a066886ddc0e7ab4d86778e1a3f2cbae82e7e041cc37148580907f2e0b39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious content. The primary attack pattern involves using a link farm to obscure the ultimate destination of the user, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4a4a95a8---punojarowoneb.pdf In PDF document text
    • https://minegociomiweb.com/userfiles/file/bijefi.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/zugizunoxitibukut.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddbb48681---29058602817.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0e0ab8ef---mivavazotaled.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac1e29870---xumibo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/59f2563d6edfc620c9af764500037a53/xeruvorikadetaveno.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/tizewinerut.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609111d441b09---8040210209.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1s1ci4ijeanqvd0qgr585558u8/61755269085.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fudjrfc27oaea8ccu54mhg5tc7/59633943222.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60def1c9---ronaw.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5h5djltmp2gsg7ata0jg0mjnr4/sitasisumevewomubada.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/15cddca7a2ce3cabd7508a52c24e3452/pizovewa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ota7b6lghlvrd1d9g0968gbb24/girukinuvezuposapu.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/48910912460.pdfIn PDF document text
    • http://195exim.com/datas/files/kibemofusifoguko.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17069c51d---32400716035.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c3j8k97t04qkc3d4pci4sq8a94/lubekosegamowisoze.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/830remrhgg12qmq8q7djmu8v8m/bodarenanulopogo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe30448ae8---pomilovikagakazaf.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609868f7d1c1a---sekure.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sufov.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/patobadubigavosovinovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=simple+past+regular+and+irregular+verbs+exercises+pdfPDF 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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 11324 bytes
SHA-256: 43186846e9e25b3c3041c745a93a680fde1bffe52158c011e4cf2435a5fcfeba
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 17640 bytes
SHA-256: 23c6febddc0821659c8c0ea75d0022e4957c3c81e7b52cd89c09e8c08b787d74
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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