Malicious PDF — malware analysis report

Static analysis result for SHA-256 7723cb173e4ad80c…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 22:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77b4eb4e1278583c3de5e6e293b7ebc0 SHA-1: 4405a1cf6acf8eda5be65d34a159bca0b28e8416 SHA-256: 7723cb173e4ad80c9c855e3c07fbc240acb2e2b2daaca7a04573a551df4cac25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using disposable or compromised hosting for link distribution. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary attack pattern involves luring users to click on these links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dcf5288c3---90791507550.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/uucekb9iujphbai5vvr8fsal4d/wezozovurifebezunededefab.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aebd674a2---55674737371.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718cd49a291---54430820560.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/92042301028.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c34dea3836c5be57f0b10c90a641742a/17538172189.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/33667517739.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fd9ba99e8---70758959490.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf2ba8260---81155660908.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/43846267446.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/os96su63bc3pm4amuv0ue0mclm/91972646948.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743cf54dcb4---95524114927.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/18vs1obr1lr0n7lrq34p99ebd6/94405535799.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2f1e459f---situvarase.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/punibuvulofineginu.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/guxuxonarevetefarofa.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ba4b2d71---69636690222.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/58265291471.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/jasuk.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/31f384988580ba5c887a531715feef50/dudakab.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/34e19771f263289e4eacc532e211adb9/rokuwulopitix.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/fc88c78d9ea0cc0c96d506581a6e955f/kelosinosunipirokum.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/niditojiz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/q83j8m8ctlvfgqlj5mkb6ild22/11172963536.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/dotebudatugibaxupif.pdfIn PDF document text
    • https://zhansq.cn/upload/file/22632945458.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/kawezavewerarafiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=standard+operating+protocolPDF 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_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 16712 bytes
SHA-256: 264fb630fdd4c27661553757709137a548959c7dcfd5de1644cbbc5ebb3d4ef9
font_01_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C9 10596 bytes
SHA-256: 41b020b8a8d3356de4ca1a3cc43c6871ca71f4e9ed13e5815aefa82288a2d18c

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