Malicious PDF — malware analysis report

Static analysis result for SHA-256 49aebb19699b2af8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 14:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fca101f5625de00ee33836776bd663a0 SHA-1: ac5d78596f2a01a76ea932398055462a487bb73a SHA-256: 49aebb19699b2af84a37ec71a06ec526f4ed1d32612a3fac3ed2a27083da5b72
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://anaminfo.com/attachfile/file/80746069447.pdf In PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074ee140d1---44940596578.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/60b645620a56d4285566c0f7d232ac13/kejitofiwovonivojigus.pdfIn PDF document text
    • https://dukupahit.com/contents/files/nifogamop.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/27242522185.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff46b4b80e---teritixijoxilifuguzizogo.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/48458686956.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905011148.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/34830935285.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130056fc7a02---lojosuv.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091313125173499.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/kobumowazisinemebuwar.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ee9a4cc9---42869957700.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/19551411244.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/47726025186.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/36456241263.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemasunovagidalawepuneten.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/66679153020.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613045523cee3---48921502566.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/20585155332.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/orh9jbe3mvr6hp4591e2uqjlh7/25705122178.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/39040907569.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/82811657665.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/fufafuf.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/gilof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+font+on+my+phonePDF 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_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 17656 bytes
SHA-256: 5d4ae3c1840fd62e9585c8ee2b6fdf97ca771d551f4cceef43a2732d015f39d3
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10712 bytes
SHA-256: 2c0bd1bdce674fa829752eeccb2802006c2ded0bf6e6abcd0823090c0276a125