Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621875a3a43fd21…

MALICIOUS

PDF

112.5 KB Created: 2021-06-26 11:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fc4e08a8b7134a5e4e22f97d18dc9c59 SHA-1: 270c10a0ce9fc5e8bc310bdc94218efd38a48713 SHA-256: b621875a3a43fd21e4405b31b1649d9e365c2b35fffe6dcb3bf5470e336d4229
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://radiosmile.hu/upload/file/35111472863.pdf In PDF document text
    • http://placc.info/up_image/jotalanidafozixazenoga.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843e4882588---73259268829.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609924be7dfdf---makasazufuxolixajovuvin.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/55c74ed13dbefc40765eee470c9138f7/rujofomifiwe.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/wetijatavopiwepixul.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/rsd734vpljpnrst3dp17c1jq47/98111496881.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/o7n2opiiv4r5r6tesr1eqbkers/jokokarudulikojaz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb15b96757---kapiruferupazel.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/73032951088.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qt3c7or8b7f3vsfeqrg6m4g1t1/1019832969.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7b2d1291a388c51cf2869177a5cab5b7/joxesoboduwafiroside.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/76934401067.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/saboderatetiladumi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160852de86de68---gixarodelovako.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6fb54f38c73612e3dedb42fbfda0d462/sujezobezanawowurot.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd59a8d6d60---birisarafufa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ueqeaau8cn9ht8puvj6jltmpu/lodalujimumu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d735872d---sodulaliwa.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/lazizazezutewizujiz.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/64683777237.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608dbfcf49781---91217625281.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f6514f41bffa8a880857f69cd22d1522/nesaxutimiga.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81f042e61---misuvaxegabekojixoporiru.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c646f19edd9---5445773487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=combining+hard+and+soft+armorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DE 19188 bytes
SHA-256: 6c4ce0eef06c7aa43c6c3f4c1879ad552269606bb4ba6feacf7dd259c4c0d39c
font_01_sfnt_off000178da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DA 2500 bytes
SHA-256: 6e3eb70924a137007b4b8fe328c5f2aa501e22b4f286fdbb60830e4d14da35eb
font_02_sfnt_off000183b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BCE 10796 bytes
SHA-256: d52bcad81c50d442f3fb4897cbd35fc859aadbb53f42d15665cb89b988e376e0

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