Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c6da84108fe4bc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 02:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1da8b9547626e4016f7c94900112c703 SHA-1: 0ef92a20aee99461f2eadb6156418cac39865c86 SHA-256: a4c6da84108fe4bc9d75394d067724da59856eeb8e8fd7fdc103ac7f8a82d95b
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple PDF link farm heuristics and embedded URLs pointing to potentially compromised websites suggests a phishing or malware distribution campaign. The document likely aims to trick users into scanning a QR code, leading them to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139427a6b668---49044428587.pdf In PDF document text
    • http://madmojo.com/fckupload/file/44215068706.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/gaxom.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/87591513558.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/zirafubukopejugezit.pdfIn PDF document text
    • http://coolscape.info/images/files/lusojiliror.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109121602166413.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/100243451122.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/popozepulizi.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/xorozubaguzokiku.pdfIn PDF document text
    • http://winso.tw/userfiles/file/fisetupukepililivis.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jelukinemofegiludidake.pdfIn PDF document text
    • https://shevian.com/images/file/puzum.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/gisoxevamejosepodatitolex.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/sagelonodutopozapuvi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/gapamek.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/guragewijokogajajamof.pdfIn PDF document text
    • http://mq-water.net/upload/bozedozazoxuwinisigejomev.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/gewajebufelugak.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8288b4308fc8a02107a7e7ec30474f73/ropumupugupiwa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9995891a---lasufevite.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/37137279052.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/vixiwuzurat.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/87428228510.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/jirow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+your+iphone+to+scan+a+qr+codePDF 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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 11000 bytes
SHA-256: d5a70025e3fb793abfbad73d1a186163f654f1e9b3f1b894acee1976b35276f2
font_02_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 18064 bytes
SHA-256: e51030e6026b8ea6731d0e3257393f6987bfe06058519095097408fc11caa196

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