Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cf0b1d29f7e9fa…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 07:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df61f12c67bf711c9119e9df82b000ff SHA-1: 6897da7e933ba4e1b04eacf4459bb1c8809ef1b3 SHA-256: 98cf0b1d29f7e9fabc942cffec3cb14aa33eb58a49fdf882a08bda0ab8d5fa54
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to download files from compromised WordPress upload directories. The presence of a 'download button' lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3bf15debf814d03a0266d0e351f039a2/dosudebalovog.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b073c6e77---ronifemozuwuvuk.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6b381d40---lumisog.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9453b34d71---54843890940.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080753bbce19---35306734380.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/79990365637.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/94127571861.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a501a99a0---71151847087.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093041e2a662---40898447950.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mejamoz.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c912426eb3---gumumatujijokibi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/924ca3531225ad99e459e456b2392a6e/xudifafalogolawetafujezez.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b0a59bfb---vomevejobawutujowoxo.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/wiwinebinuserusi.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/xutunijojawudi.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8633d15---42824858032.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/19555780645.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d407e3c6834---91126820774.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9ce25cfe---48641207172.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/46c74bdcb43c7de3f70012ae6be71328/57737398802.pdfIn PDF document text
    • https://motacademy.it/file/66835351225.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/61385610805.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1632987d922f6cd04178cc838f83e169/25237167406.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/walomojagixudosora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=curved+text+logo+maker+freePDF 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_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 17008 bytes
SHA-256: 0f780865ab755a598601b6052167527366e37f0fc4a33340ca87143a0617301e
font_01_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 10724 bytes
SHA-256: 03f6ec4eb3ceb0f912a8646a41595f59a618153c8f66890e30a6e601adb43e94