Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1064c801c36c78…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 10:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a88fe7288adfd31cacf264789f910c37 SHA-1: 688b3bfd8564ea2293634ec586f29f1dbe0480b7 SHA-256: 9f1064c801c36c780e21674f3a99cc56288ab2d24e0ef567432379c1f385826b
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites hosting other PDFs. The heuristic PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a pattern of hosting malicious content on compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vhu5cdt2vetgqk14pmd9sjgkm2/xolemagezusibowixinoparaz.pdf In PDF document text
    • https://guclupin.com/calisma2/files/uploads/gosepejosejajasutunofada.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/13658493278.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/56662837420.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8ml4cc50ib5na3adq2nke2gho3/ragutakazuzekasuzuboto.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_095412.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/41244910871.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/ribuwotujofesesewak.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/nejivebotixijiguzon.pdfIn PDF document text
    • http://freeski.hu/freeski/file/65769316774.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0462bb96---kuvadasorutisig.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zuxepasufusarapaxuvuti.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3964876a350a604035d9c6dd080ae4e7/fadup.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/wukokeburofafudik.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/1710975974.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/dijisonijaki.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7b9095c9e3ac920ca6a412262b72300d/loxitomelixuxumudof.pdfIn PDF document text
    • http://hasyo.net/files/file/bubutosiramabawi.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/72597616769.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/tasuwoligosibilipurusig.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8afca859---22424175276.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/36138560513.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fp1rlab3mohgbhm771qk0npo6k/pigoruwabufifebitipobiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sociology+igcse+notes+pdfPDF 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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10724 bytes
SHA-256: e94789bde17fd5405d3352fe9bf8da77f63866a2c1e9ba153bf760ef53236057
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 18904 bytes
SHA-256: 76da9e21adc989b5cfc4d4981018e93731e725a34780b272f253e21b97f8a997

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