Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1576a439156fdcd…

MALICIOUS

PDF

116.3 KB Created: 2021-09-07 16:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96f4c791b3fdefc7527234b49a445e78 SHA-1: 8e2a7fbfdd5db778ab54d1c069f6cedb30b06165 SHA-256: a1576a439156fdcd7882e95b491b297257acf49d443fc26bff58fb93b05bacfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607edeb587bc1---65686427845.pdf In PDF document text
    • https://travelsafeway.com/userfiles/file/91252697225.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/45802632384.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/58745313815.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/kajiwabuwofefexetetizur.pdfIn PDF document text
    • https://medpressa.ru/files/file/saviliv.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/bupavenageneminiwatif.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/vuseputidogo.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/33331461485.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210706070224442.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/sazaz.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rebopiwelotud.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/54j3dg9kjgohn3dpn1d71qogot/76080050520.pdfIn PDF document text
    • http://dzbnf.com/upload/file///rofovunifol.pdfIn PDF document text
    • https://susta.vn/userfiles/file/30447408924.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/nowixusomudobuwiravudoka.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/54ae65f9df61e12ba5c813d9723b41d2/famivaguduzekosolevena.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080caca8bce0---12017122991.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/c2ih1rufpuaioju7q3pdfrc8md/pawelutebi.pdfIn PDF document text
    • http://cecev.com/stockages/files/64514317606.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/3780645488.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/oretkkfg1uhpjr8ul8ikr9avc7/miropojigubuzej.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/nexetelodebava.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/78558870914.pdfIn PDF document text
    • http://poorclarescork.ie/images/50689649621.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/xusawelakometewiteferajew.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/xixawexedijafolenavoneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=design+of+series+voltage+regulator+pdfPDF 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_off00016418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16418 17564 bytes
SHA-256: 446aa1a0487b9236cb0a12917b8cbb05b53be402b2c5281b46dcb6db8b801c46
font_01_sfnt_off000191d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191D9 10840 bytes
SHA-256: 88d0f85771cf8e9e527ced93b089130f803fde56b8f4a29fe4ef48ebd679db26
font_02_sfnt_off0001aad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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