Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a0e3606b27cc30…

MALICIOUS

PDF

104.0 KB Created: 2021-07-03 10:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd0d404de2321d9f22e18df30cd3212e SHA-1: 9fbf6ed3b3dc6669bd6c2fa71292edb34271d82c SHA-256: d0a0e3606b27cc30eb5e9e52625d1b8ad2c0f136bf6e5167aab93983fe67e237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://catamma.ru/uplcv?utm_term=jee+main+2021+application+form+pdf+download PDF link annotation
    • http://wsm.hk/images/uploadfiles/file/votetisano.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/97691283347.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/fixepadopafufumunileman.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/61831670988.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b0dd62716e08b8748262f58d7643fa3/saladekogiludewijegi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210609_93B1A77A4F195532.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a591500691e95b844969cdcf85562b83/zexoj.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/jimajinamavodorevona.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/33412153757.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/kowidujifik.pdfIn PDF document text
    • https://room12shio4.com/contents//files/72735638474.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ed9cd2a527175907ca577a05071bfe90/9564277590.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/27470199370.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/2ktagla8551h4j7s3nftskampm/gifunib.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2356db3ffe---kogonesikodimuboke.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a795010d32d---xaduxofozurole.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/diporijufirek.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0569fe019da83c626e7f1866e76cd77b/bunifetonavefod.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081a466d6f36---fapiworonisubu.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/78955554129.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/71947792577.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accc5a4ebe9---rarotanako.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7a61733219b0a24abe56a65b968e7044/damemakefoxuxemixov.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0f86b1d0ee017d78ba4cd3d7b2f4d117/7575294345.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017633.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17633 17816 bytes
SHA-256: fa30fa674f7875140623aa45d62958ca6b4c7d7a886d85b51efb9b9887791971
font_00_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 10984 bytes
SHA-256: 3afc552ccfeb5ad1d08043de15c9296661499c13c836eb27f9a8796fb2c9ca99
font_01_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 17876 bytes
SHA-256: 90c9ce98d8913f2dba4ea0a99e5c9069b0f90cfd46f5e7f4edf5d366e45e9959
font_02_sfnt_off00015e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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