Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bbdf3e82ba6960…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 10:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e2eac5c08781040496a3282713b93a15 SHA-1: 90ea549c9c5e723a36c9ee81fe4ff016701722ee SHA-256: 71bbdf3e82ba6960346d0be9bbffad907850db564157753a825e40b423e11846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://swagath.co/new/ckfinder/userfiles/files/67762094873.pdf In PDF document text
    • https://chp-travel.ir/data/file/10523497168.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/44735981181.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceac6942e75---fozofogajoziban.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/84440144270.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/lajezesufolegaji.pdfIn PDF document text
    • https://mollis.rs//files/subakalanesaf.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/prkrqqhkoijml01bl67ishbrib/16128234763.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1248755e68af033b83dd4ebf95990db9/70798141844.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c4d8c337---repevere.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/f6sh3d6v26ok8h4s714gq8sq90/24725586885.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximozakokutigotexesonopu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0b81fba6---33225623949.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/3091506445.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/60501220401.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/tatakimozusuko.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e45c6215---32287291286.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f315c98f8.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dmepgsjcbhkuph93dfvmr5ufpo/rukiredidikabexekoka.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mejanol.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/37817794846.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd23801ec---62405286869.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/43623652759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=state+appropriations+for+higher+educationPDF 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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 18304 bytes
SHA-256: 722829df0c4f5a8697c9c929342b5cbfa4644c65624c2c93482569bc30b4d11f
font_01_sfnt_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 11028 bytes
SHA-256: be3d9b981eb2e0116e92fc944639b73cbd7b0c791c04870e67883eebac1f867c

Open this report in the interactive analyzer, or submit your own file for analysis.