Malicious PDF — malware analysis report

Static analysis result for SHA-256 104fe081e0a5961a…

MALICIOUS

PDF

87.5 KB Created: 2021-07-22 19:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f02399e55c5a817d929fa4e7e9304cb4 SHA-1: 37c017a095cd128fbdf36af7998901ef0ed6de3c SHA-256: 104fe081e0a5961aa296b68b647391fa34247625d393f1deebf034abc3f708c5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains a link farm pointing to numerous compromised CMS upload locations, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous URLs indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alemotta.com/resources/original/file/64917379018.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e1bd73d747d98ab7e464210bd887e49a/50006939193.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8382c7f3---forofizugemetixojodedoji.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/62781726166.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/42392605160.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6vl8sal53tu8akft1sm70dr7nh/2694211712.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454dc5f55---58259960485.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160772bf27bc96---37886368135.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe0b8c9d1b---rolipiginigixagel.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/10788443422.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/fisupinamubedivulilenutu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2eef5979553762d67bd6b1557548ae97/81846798833.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdaa761fb6---vubitojovubevelasemisowe.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/97944707690.pdfIn PDF document text
    • https://unosms.us/userfiles/file/99803899079.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/woxuxasibemu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/77f0fe798a82c78c3199a18542bc6afe/13096070414.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9e749828b9d351145109ab27a0ce7717/44066742966.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mokotimumirifulezoxuzaw.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/todakakinirodinosumifefev.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e45df66---zuduwelononunena.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/481ca4e73a59a68f8fc8d56d8256e573/68764538411.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/94246376926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=christ+is+the+solid+rockPDF 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_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 16880 bytes
SHA-256: 75ff8309773f8179eb0c934248cefb8521aef9c356dca580cbc0c1f477ccf7a1
font_01_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13796 10324 bytes
SHA-256: c04f1a2b1706b65800bc35ae14a3970fcd944c1342784de759ec6389171f7ee2

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