Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d0f6e79325e59f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 17:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: caefe5ed776dd21ce7b1584cd9cc9e84 SHA-1: 32809997dccb32385d81fea744af62dfaee083bd SHA-256: 98d0f6e79325e59fc06f051699d736adc4292b2d5c49b4d3492838e3318cfe91
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicative of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic specifically flags the document's intent to trick users into calling a phone number for fraudulent purposes. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://finance-bulldog.cz/UserFiles/File/67293932572.pdf In PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/bamevu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef82236d6---lujuzegumuwufubiwolemafad.pdfIn PDF document text
    • http://thaide.org/userfiles/file/80598410225.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/fozawitubukow.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/daxulozedesevilod.pdfIn PDF document text
    • https://seikai.jp/free_images/files/junowubovisikiweburof.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vidagezobi.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/pojakirevonujiva.pdfIn PDF document text
    • https://htchninc.com/d/files/96177940102.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/46503849313.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb72f2e32d---82562759470.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142211c45134---sojolofuperukijafosi.pdfIn PDF document text
    • http://reopen911.info/media/file/85144212177.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/lalekubutisabavavex.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/98154186010.pdfIn PDF document text
    • http://mq-water.net/upload/27616663251.pdfIn PDF document text
    • https://csn-alliance.com/data/files/pukizavativabudopixewow.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/dixojobin.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/25094560257.pdfIn PDF document text
    • http://potya.com/wonekufisajewixog.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/74128530149.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/wuzagunowewotidirag.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/mefam.pdfIn PDF document text
    • https://petikdaun.com/contents/files/zixasasemijumuxubav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=miui+latest+update+for+redmi+note+7+proPDF 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 10804 bytes
SHA-256: a1aefd1bb92190766c2497d5c1196cefd2123f4ae2e50b4165bc0ea6ca603cf0
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 18304 bytes
SHA-256: 41e6d842520539e9399df4e9ec988f1e5eb5efa35e4e32852e893f1647bad4d0
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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