Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0b58f086f92143…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 00:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bae9803cd396d0fa1c4fdffca1a922cb SHA-1: 3dbb878b0c2b0d113289952d4204daedf103f5f9 SHA-256: dc0b58f086f9214314b14c73af5d5ea93b67df1879e499587a62029ae44515bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised or potentially disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://weorderfood.com/uploads/files/mifokoredolesexoz.pdf In PDF document text
    • http://coffee33.ru/archive/file/vojibodefifewan.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371d19a7820---regalutegera.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/94542006690.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8764e597---lerirefejelunu.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/gekikagulijadato.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/90654777882.pdfIn PDF document text
    • http://fteq.ru/files/file/magane.pdfIn PDF document text
    • http://saktigroup.in/uploads/48343553519.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/sevot.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210924_0C07DF4DC524F835.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sisumanunagofaso.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/67758662102.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d483cd21b---lerozo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/loiv9qrneh8h64em2pomrb48jj/30722164189.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/10285957383.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/libuwodogupudaw.pdfIn PDF document text
    • http://yuli-china.ru/d/files/kevaxaku.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/50164045456.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/75546236197.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/bezopi.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/18699264446.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/zobaperuvululibekun.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/14753105834.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/91402855185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=install+app+directly+to+sd+cardPDF 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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 18596 bytes
SHA-256: 1b08d857a472fe607a0f1b239b3c9cdcba0693b028822dba82daad7b3586463e
font_01_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 10572 bytes
SHA-256: bcffee3f1adb84b568047346224e4da1b01aa01fd57d26a7cb50bddb986218ad
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.