Malicious PDF — malware analysis report

Static analysis result for SHA-256 431de5b6131775c5…

MALICIOUS

PDF

119.4 KB Created: 2021-08-02 20:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f31bf3bf1c58c9e4bddec4fdda083aa2 SHA-1: 1c8a8e5d10e64879a3e7063b78ce56faeaf4ee2e SHA-256: 431de5b6131775c51835985d8e23c689eb1c1f2e996f1e7fbed3392976189fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting search engine optimization for malicious purposes, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smidgel.ru/uplcv?utm_term=snes+usb+controller+driver+windows+7 PDF link annotation
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160904fb2b737c---46978494782.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/50159979367.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/savulelutozesogojus.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2b4464bb6d8775f31cf47bf8ffe035c9/lalomatotadumo.pdfIn PDF document text
    • http://vo23.ru/upload/file/53092406974.pdfIn PDF document text
    • https://sanidom.pl/img/file/libara.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8afdi0dspfqh195a0uo8th1evf/pabifozep.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/14237450364.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/sijadisoju.pdfIn PDF document text
    • https://cristalensi.com/public/File/salajoxerepaxas.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/jipig.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/dofowuvogopo.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/kizanerezonor.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/jiferugepijorik.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f7348b6d---5546160548.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/kefunovuremufubitazotu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sgm8rs7sg5oj3unsij8t5maoj7/mosuzenilupogigu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dojokenomunizeb.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d409b8968---87792830686.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/8135533366.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9729b4723cfb05e399bdde2797c4e0da/sepibufexaralavim.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/zirobesekigejawoviganap.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160856708a57ec---85356535193.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/savubami.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A64 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_01_sfnt_off00016252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16252 28032 bytes
SHA-256: e27256447d81d168b4a05c30546c028d58c32e2160c65711ea4164e87a0978a4
font_02_sfnt_off00019d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D99 10720 bytes
SHA-256: dbacd8642047657b8090b22501335ee98ef972f8d1cacbf23be80570c0885f79
font_03_sfnt_off0001b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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