Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf62f74f3b5c5fd…

MALICIOUS

PDF

92.9 KB Created: 2021-07-13 21:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a7ba98aeba146aa5d57eb2ff25b95ca0 SHA-1: 12338a31be90894de2f2d8cdb101fda57c8f2a54 SHA-256: caf62f74f3b5c5fd478b0c5c16ae4fa2088471be37f6296b2a4d3c7048f91aec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and are structured as a link farm. The 'SE_LOLBIN_RUN_COMMAND' heuristic suggests the document text may contain obfuscated commands or paths, and the ML classifier and ClamAV detection strongly indicate malicious intent. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d71a78879---99887684164.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb57db996e3---jabebavapukokev.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/rezisepi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be176824e9e---mukaduwokavuxizetaburawav.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db54a57c5b---tarez.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/p4vfnfjpvkcmd1c17kfdpa6b8f/vekulatosemumiduf.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7b73d05be---ninunal.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/32d0bebba40b9d2e6eebc4e1054c9131/mizitazew.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1fa87972b40d327d3d443679866eca55/94986541741.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63156144463.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/atcvrk20ei6gfilr67g97ifln2/14380887574.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/gadosiwisirol.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fc1d1b3731b5d28315c3ebc4daeb5465/85866940700.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93fb1967a7ef91b511cb2b06d9d23ad3/29984834281.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/retutezijug.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf706ea651---pezupisetinojegel.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a799917cb9a---65694682679.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/natolakovujokobal.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b56a9a5f8---62832121433.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/genamav.pdfIn PDF document text
    • https://kawanmto.net/contents//files/81697183183.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/jixademuvon.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ao0u7gdq487oqur2e6m9une4u4/97516251334.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/sasafopuxasorozofiki.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/38562666740.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pafekexaroboperirekawaxi.pdfIn PDF document text
    • http://alvasari.com/wIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=use+of+friability+testerPDF 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_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 10364 bytes
SHA-256: 7f599bb538a18563dd4a71557548df1955afbb9f298a33b8e833ab84119f398c
font_02_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 17484 bytes
SHA-256: 0fa6c64b99b1c20cfa7887b61486ebe6e491b5696f20d94f51a59b876349ee1c