Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cd4ef188f08a62…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 01:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aae3dcba6d1d5b79ca0db7a9bf9ef7e4 SHA-1: f0e21bb58198b2cc72cc2f5e0418d25748ebbe34 SHA-256: 74cd4ef188f08a62f1de23006a5e5599e9836c671315013ce7a0534e79cfdda8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, indicating an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ladangmimpi.com/contents/files/fijobaraveniw.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/851830681613b880abc4a6.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/12050592253.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/99965280562.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/sevazivalavezez.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/somukuwibi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wopuwoxosu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d45479345d---zokix.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/9p9iflfuids1ahj3ffsc7l3nfu/88730602941.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/gujalurijasoretu.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/didalolij.pdfIn PDF document text
    • http://coumert.com/images/file/jowokosedasukeruwe.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/52404429470.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144a0c62ff78---kosesapulimolezaras.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9185515b0---fenamizo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/serokonafimamuzixafe.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/f44s5suedniaqjuu4ntc2cvih5/tusot.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/54946166310.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631721314371613851.pdfIn PDF document text
    • https://btegypt.com/file/navoxevu.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/22688713526.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/nedozabinosokilesexifajap.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j3hv5sujfp050kt7r7fd6tkq3k/jogufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=final+fantasy+tactics+wotl+apkPDF 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_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 18380 bytes
SHA-256: 937c86cafb4b938bd4104d96554f58c1f802772179854d04bcfb25ea395334a0
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10512 bytes
SHA-256: a38ce74ff09fc38736d5712ae4215474537fbb20f229b971977c0674fd65d448

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