Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e93d1b65d6d716b…

MALICIOUS

PDF

114.7 KB Created: 2021-08-16 07:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9a1360be09dc40e74e73b302ad16dae3 SHA-1: a32a09cc2a4f1243317de28c750a2ffa84b04d82 SHA-256: 3e93d1b65d6d716b5bcf5e8a88d1ff5ab18af29bf6de082b9c9f224f18f0bebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the file being part of a link farm hosted on compromised CMS uploads, suggesting it's used to distribute further malicious content or lead users to phishing sites. The presence of numerous unknown URLs hosted on various domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6491c775---68395137235.pdf In PDF document text
    • https://austarpharma.com/upload/files/sudisub.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cb6fb7129c87125c46373d2834dddb95/dewukupebiz.pdfIn PDF document text
    • http://isgsrl.it/images/file/pozulakiwawutukuguweme.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9f079a5d---62544881803.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/tonojinumavasonuvo.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/mabibumuwupezanor.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/16440567456.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pcnqi9lbenkb1g83t0b21b5v9l/1082694971.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5abae21bd7---64661215624.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160922eeeafc8d---25236036688.pdfIn PDF document text
    • http://azizolace.cz/images/file/737097725.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ssp04tgv42upjicif6it4u0f5v/nebivepu.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210730_002610.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a1m21ddsvd31bugfbfogkn2gjs/fozawemuvurumoxor.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/koxiviwopivozibiziwomu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa45b00664---sebelekozarav.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608441f37b422---feragekirexuse.pdfIn PDF document text
    • https://go2germany.ru/files/file/pijolixatodirirefiriwepa.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fapulagewevamuretati.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ad99054176f1f0f1c6727eaeb3a15c0d/morilujusidudexejif.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/52323046518.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097982e25c05---gemowu.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210616_A81DDA5FC2E60512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ssshhhh+koi+hai+vikraal+full+episode+tune.pkPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16173 10996 bytes
SHA-256: b255ecdd9c2fe65851d47103fc15e8f685e7e8c7b5ac673e8cab7b758a747c24
font_01_sfnt_off00017af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19308 15848 bytes
SHA-256: abdc1e57ad90c73e1d8cbb98bb570f763877ff95d9697321a3c26ee800061eeb