Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd39fe58d15ef7ec…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 15:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d6c3c35b3668767b61d73269eb5ebbc SHA-1: 6a286a6eae59f2879ea23d408d2050c060522e92 SHA-256: fd39fe58d15ef7ec5f29289cbef9fb2cc8770aec050dd93899eeb50a53dbabc2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://perfecthospitals.com/FCKeditor/file/70161623662.pdf In PDF document text
    • http://kd-council.com/upfile/files/vifowofuretixenewusor.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/19791958492.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/4249988717.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wofutipibizit.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/19029074713.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210911142115.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/wosezoxenatokaxogirufute.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/finorigas.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/novebuxojuxefef.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/sepokumonesedem.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/82528837981.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e7ba74b381ceaf6d9a31f274b97dd22c/85615280353.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/rebukivezuzizemipizaj.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3206c88c57b6e2d5ae3e41bcad7301c1/34853805763.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sedopavuz.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613502b6cf525---doduv.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bonaludogivase.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/48413411637.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/10187817429.pdfIn PDF document text
    • https://hse.tw/upload/file/fosalesege.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/35887335490.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/tenifijuwazi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132ced07b6d9---fimodemumarexe.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/31313244715.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/lesafisatiletewalar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=john+tucker+must+die+full+movie+online+123moviesPDF 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_off0000c217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 11172 bytes
SHA-256: 096211649bce83cc2646fe8e1bcf09d2d6e313420219e92e347412f2f146b20e
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 17504 bytes
SHA-256: aaf519bc8a1c5da9a1a73adcaa1fc2b235dbad44535dcc459b54a6b2db719736
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1