Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa3b511643f3e21…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 04:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ecbe81e1b56eac4c030dafcd47bb0cf SHA-1: dd36d08b9dc1b4a618c66b5b9d17be0b52879003 SHA-256: daa3b511643f3e21755b309baf705f2cee7ef82c7f95b1e89e5110f8051170db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pejulor.pdf In PDF document text
    • http://szentistvanpatika.hu/upload/file/maroruluzoviluru.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/55026202720.pdfIn PDF document text
    • http://fitviewer.info/files/file/74633329026.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5a63efb98adb04252bcb31676e13e561/63790948611.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/852f20bcfecd7bd82712b6021fe6d64d/pabol.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/62126261924.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/96270875232.pdfIn PDF document text
    • https://emenu.hu/editor_up/govet.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210906_031418.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/mitotidatotunibubunajama.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/99334144140.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/lisuxawiworodigebuwip.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210909033725.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/62429094992.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/17842967582.pdfIn PDF document text
    • http://synowka.pl/galeria/file/surukopevimetotapazix.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/31622135786.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/42844132766.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/dijawumulowuzodifi.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/26476481075.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/pedolumoxatoropibitafa.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7ae5838762c5194c92ef1a40a73b45b2/50672711840.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/zoledezagodiwin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bus+id+mod+apkPDF 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_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 18312 bytes
SHA-256: 7b090e1038bf6d92113e5afd1e5e5de13f17768b869f12318760f79c1547d3fc
font_02_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 10320 bytes
SHA-256: bf47d85eb4e427651a2e01984e8cea20a8c688a1da99b5d943be914182f34dfd

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