Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cd0da5d6dfeb57…

MALICIOUS

PDF

99.8 KB Created: 2021-07-31 13:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73da732f77fb40b953396353a7ecea7b SHA-1: c53e6334e4f68714b0faf73354aa08a7c64f3587 SHA-256: 44cd0da5d6dfeb57f4dcaa9f4815c46b2ba58677d826fb8cf797efee2c690285
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a4450e454842e101fbe3f6f59ea20140/gomupo.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa051232510---28410877124.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/rasusesovos.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fajotosesetinukedaluf.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/kavawadebufutojeburivum.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160866990ce302---wenufitakusesuworoj.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9db0e4da62---29434126013.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/88871169342.pdfIn PDF document text
    • http://apvn.info/userfiles/file/ramebe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4837d818c---48551387708.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210528065707.pdfIn PDF document text
    • http://cosyromania.com/media/file/94189763903.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/kisuzofofav.pdfIn PDF document text
    • http://wenxuezj.com/images/File/10462353167.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160972087522c7---fitedugumawebelugeper.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/goxasugafarupujajutuf.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/47335530270.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/treob4jr5293rs0pftfb0cjpn2/76812838026.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/fojab.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e353e3ae34f---72710981788.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/95402970171.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jetasezomel.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bj3f6g5ch7dtu6gpnoqihr42k9/86688751651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=is+apex+legends+hard+to+learnPDF 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_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001394b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 10632 bytes
SHA-256: bb3a3548d1aeb7c8a033a679b987fbb468b3d136cb5ce3ecffb1d0a86bde567f
font_02_sfnt_off00015160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15160 17992 bytes
SHA-256: e23abfc20a1a9d50fd27c8ca6d979e0049af11c52e2d282ef8b5914db44eafc1

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