Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf1672005f02db…

MALICIOUS

PDF

112.7 KB Created: 2021-06-30 09:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6a51be760d3f32a9dd6f161599fcf11 SHA-1: 40d6ce3e90c0df286fab495eded95b481382c615 SHA-256: 6ecf1672005f02db83ce9f82591f52cde205183765f6337e2250a6de97a8ce9e
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content or phishing pages. The PDF structure and embedded links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=schedule+2+of+wildlife+protection+act PDF link annotation
    • http://vuatoyen.com/uploads/userfiles/file/73367602603.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8b80683d5f9b060c331ca88ced32502a/tewarirezemodavigov.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a28e81b39---roxabex.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/73054830023.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a3550020---42398156819.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acec225c757---pigobowiguvif.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88f69e999---tazivobufekurebel.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab8704553d555fe859fda4564df41b2d/50220105523.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f7044c90db10bd0793c1f552ac8fbeb5/34734521338.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96313e27e7---riloruxixekerofanarojufef.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/72rgjvfjbo7mepbbmeurpae1u4/womepazajikubewuw.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756e1330334---sazikowunamuxedomesu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7jn6hggs0hb4s286b30sbgap4k/xaxexowemineloripel.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/afa6bc722eb8a6155d75a274140a7351/30776064511.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/760f6e5eb51c30e601fc7563c0f18cf3/kikaxukevupopigisagofoza.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086689db1e32---93294750242.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/69463750653.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zurogutifarula.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f921b5f000---jaganuvexuxibaba.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d796fb9d6657839f64bc6b4946a04d20/bimuvepusi.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/remajifu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160727137dd909---dofolosopoxomekow.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/tafijewidukovupimaxik.pdfIn PDF document text
    • https://andrejc.si/files/file/fubulagadipaselugujoxepu.pdfIn PDF document text
    • https://bit.ly/2woIuzBIn 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_off00015858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15858 10928 bytes
SHA-256: 5da465f66e7f986cdaa890c9460a614203333e84056c121283eaa560fa55a9b8
font_01_sfnt_off000171be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BE 16636 bytes
SHA-256: ef42243c63ae7d107fede429f2dd3f391a93e43cb12eeb5656434261e7cf5d29
font_02_sfnt_off00019d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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