Malicious PDF — malware analysis report

Static analysis result for SHA-256 053e4f30300274ae…

MALICIOUS

PDF

82.1 KB Created: 2021-08-15 10:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 250a764698d8fd436ebda25cdb14e40a SHA-1: 5ed8ce6e162a823497de21a16400f1d911be1b91 SHA-256: 053e4f30300274ae23bb9ef3a110a94114db64e24d93628c77da04b466d42395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to compromised WordPress sites, indicating a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external, potentially malicious, URLs disguised within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=how+to+check+if+someone+blocked+you+on+discord PDF link annotation
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749a4a44703---fugerovaradu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/22sqedd0dej3oictbm1afv1ce4/69745681932.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/soragazo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d77ea4568---389721628.pdfIn PDF document text
    • https://agatanorek.com/files/file/zasofofenuzif.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c96b956d5d32d45a003c805a85ba68b/52940082947.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/26cf3bc109cbae4f156edd69315af269/6029137344.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/sg4v0emvv0euu0mo13fich0q84/56467336819.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d868f74a90---ziwuzelibebawa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/xiremufegabozojuxo.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/lezigirawizepakunagoviz.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/tawegorevurigawasis.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/85934542472.pdfIn PDF document text
    • http://pb-book.com/user_file/file/rolabijuwadewiz.pdfIn PDF document text
    • http://cl-pub.com/files/files/minimibepuvurawomu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/37102213781.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/mibilusemabuzinijifipel.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/sufex.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/durisabij.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ad0a4052040c64423fac23348bf4ae9c/66722150699.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa49dd5342---delosifisawisosofewafop.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de24d25a9f8---59466964011.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4551385a---bawilivabufotin.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/899accebea4cc0e79dcd309ce5bcd94b/simoxekivibabu.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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 16872 bytes
SHA-256: b98d824a27867b9aec6c5a9185d9935f0fab1b1a6a15d89b3ab6497e7c79fa4b
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 11100 bytes
SHA-256: 3b62888fa5ba4fb5cf94b1511568f919c71b163a11c29448c3b90c4dfb409b41