Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21f49a5157c1cf6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 07:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ed197271f86fb7440569414f5b561d8a SHA-1: c7329fa8b0abcc6d36771198d751dcb6a0717b89 SHA-256: a21f49a5157c1cf66bd5075ed7255f569bbc26bd4fe9ce66cbab85a38ef41fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=jee+main+2012+question+paper+with+solution+pdf+download PDF link annotation
    • http://phuclocvienjsc.com/uploads/image/files/savudonidupix.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087580669b6a---panivawowolezojezafogulax.pdfIn PDF document text
    • https://songhong.info/userfiles/file/tifunaxugimepuwodix.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/4821270909.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/dogabapifowumamijum.pdfIn PDF document text
    • http://quinta.cl/upload/files/56424730453.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/44006973132.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/getanuto.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ae05bc81---notixuzodukamitanegex.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/47073025337.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/83ufqkcp9itsok0so5d87ckro7/mizulogovis.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/5948402388.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/13130736016.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4e609f6a1ce15b5e52f9c0ce2cb5b2d9/71626896210.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/27297996325.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/27815266510.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/e9j2o3os11ho7ku8l27up3r18s/75066621143.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab4557f5c5---30871902472.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7129f2034---kifolejinurubaxuxulexazid.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/fegebowefenakuvosiz.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vojoresug.pdfIn PDF document text
    • https://edgecs.com/documents/ditopimowowalifofemepuw.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abe23a60080---futobavafalatugug.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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 11380 bytes
SHA-256: 568730aeb7afef93c263b1d0001cbfc635e736c6b6f6005bfb7d470fca6afc32
font_02_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 17520 bytes
SHA-256: 298dbd594f56a1a1db633499e5796d0d5b02c86e4a1c8853a075f1fd2917c84d

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