Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f127c96a2068f1e…

MALICIOUS

PDF

88.8 KB Created: 2021-08-25 09:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15136ea71cb5c0e712133c7681c46a9d SHA-1: 4e681fe37e152350b7b62511e9274f24095a58d6 SHA-256: 0f127c96a2068f1e3548a2a88e5165cd5858b9ff9d7ba079533736a8e5b9665d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this PDF acts as a lure to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r9l9nbj7pho8fp7rjj6nt4s753/tuvurekomofivan.pdf In PDF document text
    • https://wheelmartthailand.com/image/upload/File/47236576727.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/sitolefenixugubuxoleganun.pdfIn PDF document text
    • http://myredm.ru/uploads/file/regawemudugidal.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160e80eef89974---beruvifemume.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/463v40jk57519fne4j8lcapkji/jikiga.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/61c7927a56c8be320ee461e2b435b485/kilewefowuveb.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dd9c0f4249caa377b04d1e2a3a5632ff/56624268775.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084395852226---32367088708.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ee521a43858b5d0b4f179e7a6c824e3d/pidibosugipuz.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/27903477500.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/3767847404.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fenamubiwukelovir.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/jusorapawupipamol.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/renuruwapisuta.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacb7c4046---24964768727.pdfIn PDF document text
    • https://orrizon.ru/images/file/27429813006.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/23/65826166737.pdfIn PDF document text
    • http://teplospectr.ru/images/files/jufatafefofati.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b236e3da4e1---32976353237.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb445c83a---58162195623.pdfIn PDF document text
    • http://ausafe.net/images/art/files/nulijixu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160797a0ca8849---naxamovedipurijiwisafeni.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a551483fdc09effa2402d3413f4d1176/vajiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=aptitude+questions+on+volume+and+surface+area+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 17444 bytes
SHA-256: 4f7e41cd95251bd14dfe704042e6dc3c3ab356c91a56785cb712469b279d2a0c
font_01_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 11076 bytes
SHA-256: b83188f7753f95ff4cf09e2af24cfe8abc5a86a81300a66f283dbdfd15cd70f2

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