Malicious PDF — malware analysis report

Static analysis result for SHA-256 8884a9b52bb966d4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 20:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99726f04de389b1380ed4f37428ed16a SHA-1: 2451b74ff98e167374fae03a8ebccd59c4d03c5c SHA-256: 8884a9b52bb966d4a05c0a11e59ec0e9d5d4dbfa1dff3f496588f85a240d1446
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gyermekhaz.hu/Content/site_images/files/45926593307.pdf In PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/96781603926.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907164722923286.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/surejozureja.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/95658221965.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/9582015510.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/23154860384.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/midawapu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tamexinasulerema.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/68936910171.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/21693280448.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/28210171699.pdfIn PDF document text
    • http://retailcop.ca/files/vedifiwu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e39dd9e96---90852378305.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/fajibug.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/57775582875.pdfIn PDF document text
    • https://phunhai.net/upload/files/30099546872.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135b32543a67---miroladasokiwegimijatal.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210905103431599.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/wivugumoximesawimuz.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/77260560274.pdfIn PDF document text
    • http://polipack.ru/content/file/gegunejomotakogazimi.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/najunojuganuzavudiwokud.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcffac2cb---31697821104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+cheat+dream+league+soccerPDF 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_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 10912 bytes
SHA-256: 4e1e88001704cb94908c1071720f2f3c8dfde4c75e978550f00aa527cfb7f80b
font_02_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 19188 bytes
SHA-256: c98c20f8319cecab2181162a27645eda90fb8e3b7d0298b7a2692d9fb6a6543b

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