Malicious PDF — malware analysis report

Static analysis result for SHA-256 5390777c63b4dd6c…

MALICIOUS

PDF

114.7 KB Created: 2021-06-27 16:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 12e487eb42f1e94e7202b6aad38628b2 SHA-1: 10e85ab2be76ffce2da5269428026187b78f6e6a SHA-256: 5390777c63b4dd6cee0b641727e549e229297de6c0b1556f8df30ab1919e608b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to distribute further malware or phishing content. The 'SE_CLICKFIX' heuristic suggests social engineering tactics to bypass security measures, potentially by instructing the user to execute commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/62b13a5d30b8b0fd7d1be2a1f6c536ec/33223383931.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/79dceb92c65f4f0fec6d45f8202e34c2/29116458404.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/5807e36955c9a191728efcbf40cad67f/rudojumifasidudewupo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a418cbef---97397534024.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6dc4724e025315aab9ad978d28fd8989/1818721288.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ad010db609283c300dc25e4dbe4ea88f/xubezovi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/26344494956.pdfIn PDF document text
    • http://dnepropress.net/files/file/18833464257.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/624933660482c1ad2eaa8775f92eb3d2/relaketusomekinadajupafo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a44d312c6---fuxibukatejapubilefunidep.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c7a054291a7---82777875129.pdfIn PDF document text
    • http://aimic.com/userfiles/file/jalupof.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607216cc25edc---fefamep.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f6141813---6626019223.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/lonivizas.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pvd6v8956c1oskd255rqeigs65/xodasezipisetoto.pdfIn PDF document text
    • https://europartner2.pl/uploads/45269660604.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/20/98311261680.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///ralawasa.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/amgm48s44g8b9ehj8ocdsdn4hb/42896786134.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/57131284381.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c130152b8df---51658533524.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3340775325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+free+online+pdf+editor+for+windows+10PDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BED 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_01_sfnt_off00015146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15146 10640 bytes
SHA-256: ba6e43b50f7033486b82cf0364bacb80a7347f638eee205e0616767ce3142816
font_02_sfnt_off000169d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D2 18920 bytes
SHA-256: 86715999019973ebe97f061f0396866e6e10b0f1b90a2d05bda1b6840475bbad
font_03_sfnt_off00019a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B254 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963

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