Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeee054861c6316d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 08:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f8b74b5d68e14706edf23f071e55de8 SHA-1: d210150ac81f0dbe36da41f64d50f2d8796fb05f SHA-256: aeee054861c6316d82f621989cd109a90a5efa9a6e8cc37abcb28b87e3626dd2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various websites, some of which host further PDF payloads. The presence of a 'download button' lure suggests an attempt to trick the user into downloading additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sweed-trans.eu/ckfinder/userfiles/files/nobeziwamowoxubopulib.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e2ec3ad---tavenumiko.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3c00443d853a978d5474726fd2b8958/ropepegomazijoposexepi.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/pekapodutododurudulor.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/zitib.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e935d19e2---40890840169.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630551023tusekedudetomodajivek.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/59449771794.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/gugakawepebupulezawujoniw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/55608026293.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/19433932152.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0b0196e57763e74f3da9928ef69c2bb/saxibugeg.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/44251325516.pdfIn PDF document text
    • https://svltv.in/userfiles/files/birupuje.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/xaxiwumexapitivelavajake.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/vusuduzutewojovetosed.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/kopufedebunumudivageb.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/39310129634.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/betuxogimegerap.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/lufenuluxud.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xevususu.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/jeraduz.pdfIn PDF document text
    • https://profm.hu/files/file/79764678780.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/25300267217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=avast+pro+apkPDF 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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 17688 bytes
SHA-256: 73d606d861310512903c29cc9eb0909d1d4ecd0ee3f9000331872bb7951dabaa
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 10008 bytes
SHA-256: 50c82ee441dd60724df514fdcaab1683afbdac44693922ef2664e9a7c75062ef