Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bcb272a4d672c3…

MALICIOUS

PDF

73.7 KB Created: 2021-08-05 10:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc2d6806e291c4a1c9b2b6205ef72261 SHA-1: f106a21a257b1eb071caa74dd01dcce1ba6544ce SHA-256: 34bcb272a4d672c354898fead2793f0688d5adbb172f9dc9bf48cffa4bbbb9ee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Numerous URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lindendirect.com/ckfinder/userfiles/files/15569041684.pdf In PDF document text
    • http://quatanggiabao.com/images/uploads/files/69118752804.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cf79c6e1---kepog.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/tqejiku2l10kfe7dfphhr5ii02/zafuzuzo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd837ac709b---libinemutodul.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f13c031e1ac303351cc4f74cf4c351cb/bajafivo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/da322a467799be06eb2681a5fe9d434a/mepedejapogasonogiw.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/71343056224.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d074bf0b290918e20ffe10489883a114/83581560626.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/52257772467.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54f5cb39a---34152999156.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dd35d336c---votuk.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072e6303e5e2---86224180331.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/62304965627.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/9250188042.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/pikalatera.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/wonepamamebofadi.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/lejesafezagirege.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/30136972419.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2a5fc704ffb50e6aec48d5381cac2ed7/49749819078.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/sugekezomave.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/jivigutufugubir.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/87296648655.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084efe6acfa9---50717278637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oxford+advanced+learner%27s+dictionary+9th+edition+downloadPDF 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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 15852 bytes
SHA-256: 9b63afbef3162df5f6fd25dcf5a427da65a6aea86275c2842a25ec41ad1006b6
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 11168 bytes
SHA-256: f4b2b56a16d0817fc136dce6f0c21e1dbc9b3c37e3e35ae463fd06d25ae218a8

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