Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d68871fe5c8714…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 06:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bb874483123531a58c831b082e8fbe3 SHA-1: 49c71e22ba6ef4819cef55cad48bcf08b56da11b SHA-256: 19d68871fe5c87148df6f6efbde86b950403726cc236ae10ba2b5e183c699a16
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17466612867.pdf In PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/72390894873.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/74258330371.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fb0b0ae---motatot.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c3fcb91d---gonenu.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/rudetipiwixa.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/korawazimewipipamabuvomo.pdfIn PDF document text
    • http://trevorhannant.com/34215921980.pdfIn PDF document text
    • http://grandfiltr.com/files/file/vubum.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210911194750_1769774027.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v9ci0qrr1c0t75f67bjhqrjkc6/85561304724.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/61387868874.pdfIn PDF document text
    • http://boki.hu/editor_up/wogupap.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/59199896971.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/mikekela.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/wekupijatol.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/34306529473.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/15155424366.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0457bb183---76015244385.pdfIn PDF document text
    • http://tianfonmm.com/d/files/37513421439.pdfIn PDF document text
    • http://khocabien.com/uploads/files/82528857759.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/447659904613750bbf175d.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xorodufomak.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/28926995143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hill+climb+racing+2+hack+coins+and+diamondPDF 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 18380 bytes
SHA-256: 0b6fcff342ab96c94f561cc8a6e6e8e9abd0239c0d2040e6d519b48097ea432d
font_01_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 10932 bytes
SHA-256: 2d1c71b94761ca9f5433b964dd3f86c45a67289d0607cafa8faa24bfca7bf612
font_02_sfnt_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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