Malicious PDF — malware analysis report

Static analysis result for SHA-256 167953e5b6623586…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 14:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9436ed4fb91eaf2d94166d73d4e49b8 SHA-1: 760466f9ebfd62adf72ba2f747325bd32d6d5947 SHA-256: 167953e5b66235862fac9cc2a1b54a12057a987b8fd5877813ebff9f100f7aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6e76dc5fefa03c9202174f8d91b863b0/zazevorodasax.pdf In PDF document text
    • http://zs-oilfieldequip.ru/d/files/bologelexasip.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b53dd51c7c62ff0fe40abc57857690a/kinekeraxuf.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/59923256298.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21e273f74---83672733035.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/60837375901.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/narinebofuroduzoze.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0559614de---24592233741.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3fd32a4c48d86613fa2790ca7b42da61/87700121461.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609e076e42f74---98583859202.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/48251766879.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5291605a22---32986825573.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608b051320457---90865549669.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9ecd5be428099456347e7eeb024fdc7f/suzenu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c5324e3d---vemisaxonidaguge.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/7803662367.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99f4d946e---88291695417.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/xakegex.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4ae4d341e2e35f57bf499e08ddde6198/sebibajaberevobun.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/63379159292.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/7a6797e72899053882e24a8d0e8de38b/wokafujaxadajadaw.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d911ec40b85---sogipi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7a6305e9397b7b55ad50e427fa6218ef/jekora.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ace8d90539cafc08ecf9c6a49847721b/zagekelexevogitim.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1659777517ea9ec72d726ac2c81ba7e6/davaxatefifotazomoko.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1458f2c30---matorugipiril.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/waxexaxizabela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+download+of+tubemate+latest+versionPDF 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_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 10884 bytes
SHA-256: 4203ee00bfe13a8f713765cd15b68c1f3f20d4b132b6b0486fa2dc8fa6a0cdd3
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 17296 bytes
SHA-256: a0f2597658ca189e6b197d1442f4921509232f0e6d781c69044a78bbada5e98e
font_02_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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