Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c13f41eec595d4…

MALICIOUS

PDF

71.3 KB Created: 2021-08-29 18:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7827556b537020cc14372a5907ddf03a SHA-1: 4041ccb25a4028de44c74038f2686b7cddf7cfa8 SHA-256: b2c13f41eec595d43777a6e5c358490390563dca7b834275c39cdc7034bd41f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and a link farm on disposable hosting. The primary attack pattern appears to be a phishing lure, leveraging a link farm to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=tell+me+you+love+me+mp3+song+download PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089769d43fba---29222697498.pdfIn PDF document text
    • http://iphysiology.ru/upload/lapinuladovezelugujodafa.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e65b85a0a---86018509928.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/12b4a07dbc8439c59e63a9fc8a3ba158/mojanipawuwerazejudol.pdfIn PDF document text
    • https://redac.ch/upload/pusozejakujuve.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/45779047135.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/82554738101.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/435582948911621058075.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081218113973499.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/68626615194.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vetamolit.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/fazodasaxifesex.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160853ec770532---40131807083.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fijefidagup.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gadimelugube.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/tanefowovati.pdfIn PDF document text
    • http://sung1.com/upload/files/65435390996.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16221879210757.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/32157882191.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/4912583851.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210516164411_2106554630.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d921f8c40818efa59a2c0a2871347004/tojesumaviwureta.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/94219221100.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 15732 bytes
SHA-256: 531b8fd83f1271516f1da2faf682c37531d78b3f9d1b051d8922bac121a1a84a
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10948 bytes
SHA-256: b6f1189b8bbb3a2f1b0836163f6584e359983dac86106ea644b53dafb6ce665a

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