Malicious PDF — malware analysis report

Static analysis result for SHA-256 784ead9559f2731a…

MALICIOUS

PDF

76.2 KB Created: 2021-07-17 23:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c815cc75dd4440236e6ad86bb1d5452 SHA-1: c8da9ed33d7aa980a8b815f57cdf5146780d6fc9 SHA-256: 784ead9559f2731a45147be0d44ef969bc3f98f4202293703c8b46436e00cd9f
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bagstyle.uz/images/file/27951673465.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/432091f363ea9a022dc5f929f8b14d5e/48711844839.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1622497958bowezanofowuzizewupijina.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/56170137593.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607424513a350---xamogowosalejuvuvagor.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/15b1b4ea6533d15509e7816fa5efe4a7/26590150007.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf4af0c22---95042271242.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zebanirudesaborexa.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/tadokodopu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sadofuserutiwuxaka.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/34541799903.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/887add19939bced055ec3483a15506ee/75674900685.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ljq588at2tdl2ntqjfvijcsjq1/ragalapefulefufawo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/68517835496.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255f800032---4520387201.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8cej5vfbcopqc1m112bqjdint5/vajejotub.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/bamikovolesojogumuxemotem.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/63340572243.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/56102155667.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc237fcfcca---42983506948.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/36045062214.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/petunam.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5006cc7fd---17768516002.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d8ce7c945---63711741849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=interpersonal+communication+everyday+encounters+9th+edition+citationPDF 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_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 11176 bytes
SHA-256: 0d950d541ea23d1048f4f9dbb1742b40b580086152881de90e6f98e099d8ec46
font_01_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 17088 bytes
SHA-256: 6f759b7b2c02748ac830b5b3cd235f49ee519db45b5b05f9c0e5ea576fe19882