Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c1a1d08d24dcb1…

MALICIOUS

PDF

92.1 KB Created: 2021-07-20 10:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a812fd17ffd75ffd3e6e337a66460a9e SHA-1: 1e990e3b7b12ebdb2cac2a2b4a2282e02e4f827d SHA-256: e2c1a1d08d24dcb1922c7b0df789e50a0018b0f4550168afdbe6e2d674e1edf2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a malicious distribution method, primarily through its extensive use of link farms. Multiple heuristics indicate the presence of numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host or redirect to malicious content. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://afayl.com/userfiles/file/21160744104.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/466bfd54fd1d98b44f2b76c532eae7c0/lixutasanomebifuzis.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/89eec786f14687bde61d516789c9b5e3/fizusedovolanomuxajafapes.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/26734315375.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/bowuxegupufewu.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/49785669617.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/pimivonesevugolugura.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/20722085822.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/795c6f146a462ee8eb19ce2c87b7da76/24241206712.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc08c4161---34756485628.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6c85d3eba0aa82e6d5228b2b9ece8ff2/pisure.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6bb3ff18cd7698c7e34a81f5bc77f378/wowafosenejerasava.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0199802a89---8118309026.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/85of0nvkko0grp04if6m7vbtr2/80145512581.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6af2d6da---nusujijejutipakuxumonof.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/refuvupazunozakowaxudisox.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/64435636319.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/35264655557.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/4378157559.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d9d72a1ce5f0493c72f9b811065272c9/lazufobaz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f13c46e6c---zotim.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2746c98272d8d76f3bdb7cbbc8f48287/99922209648.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0231jio67bavfg1srkl4u5fost/puvuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+standard+state+of+carbon+justify+your+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 11092 bytes
SHA-256: e3e9077efd4fc20e72d94fa81f5cd2ceb11c3a4f2a16088d65e7401259ef13aa
font_01_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 17588 bytes
SHA-256: 0d0edaf6d48142fd37d01ba684211cf4a567317487b5e0a9d762c98e70ef56ad
font_03_sfnt_off0001593a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593A 1980 bytes
SHA-256: 02990af5df9f392d5ba6612e4564f12aaba286ed3b00249a88ab8b6dc0af0cf6

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