Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fd75a039f3fe50…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 15:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 017029f11f4e1d9abfce35b971e65245 SHA-1: b1f07d9dae9b2a8f4b4ac20a02273df9afc4c85e SHA-256: 39fd75a039f3fe504fd0886e6fd976a312e4a91620b05677ed8597f32b447e41
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of numerous links with UTM parameters suggests an attempt to track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=vive+le+football+app+download PDF link annotation
    • https://kalitelivideoizle.com/resimler/files/mosam.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c5af6af5a1fcde06cb25c146bd49a359/37595136974.pdfIn PDF document text
    • http://agrion.org/upload/fichier/wuxoxusiwojo.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/zuderuvesesidipab.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/54250935792.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/40386360620.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/vedawivovejevujumegosomi.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/71793218149.pdfIn PDF document text
    • https://nomortiga.com/contents/files/sigopamaguxevivozugubufid.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/18716147769.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/56659775290.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f066342880---39746982714.pdfIn PDF document text
    • https://funbugs.ie/files/file/xewima.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613304a6b2625---nuzosopijum.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/nepuko.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/16753675794.pdfIn PDF document text
    • https://proia.bg/userfiles/file/40688761217.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/ledokemezi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/543a2c3644ef626d900b5aad6034a9b3/retaziguvunuwiturewi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9e3387800cac89b2132dd66dd8b3e398/wesinimalubudovo.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/64365671312.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c36705780---pigubozadigitijomuna.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/tokus.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ec337198363c6f6093f9eace3f03c50/46789737527.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_off0000baaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 16820 bytes
SHA-256: b07fac1f3b663cfccfa2734c2725b80a1a5d23cfe89bbd1ffd43670c840263ee
font_01_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 10484 bytes
SHA-256: 92bcd51a6f9c3d296402c61996caa1652d9b199bd37f398211354518b97f7546

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