Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b5943086e5c036…

MALICIOUS

PDF

90.2 KB Created: 2021-07-29 18:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4843126a7b7b91c42e13f63ce64ce59b SHA-1: 350db3b0ba8603504ae5e9c3721d09d31d1f751a SHA-256: f4b5943086e5c036efbe8711d6a6b181847a494279a07306d4b22081ed4b8134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The embedded URLs likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://drafthe.ru/uplcv?utm_term=what+are+some+smart+goals+examples PDF link annotation
    • http://fluitec.fr/ressource/site-image/files/jixuduvafegaxopurove.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/35564302218.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1c8908c6c406692579b84d3b2fd01cc4/lotimilo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16072916ed9946---molewod.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/sefabuselipebo.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/39581440142.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lenuri.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b68979054031dcd41e894748061a2350/sulumaw.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608166f3a7e9d---79479903695.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/qk0v2dpedks5q6g4785lsh1m1m/lozazuvapi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cr5mv0edi7cl1cd0apaet3fbhd/wufasexuwod.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48508410654.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/11414361975.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6cac5c8fe607b37c74df823da01287ae/54655019464.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/30335994360.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///lupopisupe.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/040aeb065dd76a64ecf528191e7d7b5c/bawoludujogevekuf.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/tidujuzi.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/52154565053.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757f43b0edf---97048464276.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bagaxitatuxekefurino.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/52580788422.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10596 bytes
SHA-256: 22157ace102c76544246f81f0249ec588dcc13168c87ba90c6bd06b4cc958c87
font_01_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 16620 bytes
SHA-256: ac19c7bb4404addf5193456b6644339c436db416b85a2359f1743daa7eb6f4bb
font_02_sfnt_off00014345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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