Malicious PDF — malware analysis report

Static analysis result for SHA-256 d031002fb792f1ce…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 03:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd1299c90b16893cd12687d49c12395c SHA-1: 355b53070668d08d4f7182b878326a53f794127d SHA-256: d031002fb792f1ce437eed43f4fd512c5ead77acd59f9f47e5a4912c66479c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically phishing. The embedded URLs, while numerous, primarily serve to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://15881588.com/ckupload/files/42446202448.pdf In PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/85523987931.pdfIn PDF document text
    • http://capital96.com/userfiles/file/36170787399.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/4664526905.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/70210562278.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/bezujejomenaw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409071a0fab---sudolexi.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/50585559386.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/kevikujematetufodu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6b365feff2a870b35250bc49a2fa8375/dobatomupefaxipaz.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/xipirewabegisukoko.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/sawojigoj.pdfIn PDF document text
    • http://www.agot.pl/upload/file/rajugefelinovanu.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/44941120119.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/94216009125.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/xosaxetuxar.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/niwugadelobe.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/44622065629.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rrofr1fha0q33ik0a8e62frlj2/75015118877.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/18875941085.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/jidegelaxibirevuloderi.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/tevipijomiremew.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/satadetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=friv+100+gamesPDF 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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 10300 bytes
SHA-256: 5f9dad49ea67e03c85790ad3a4a2ea9f6263ccb1c940f5af293aa0821caf4817
font_01_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 17372 bytes
SHA-256: 16f17f6981c55cbeae8e2f98cd4973878346b2855f45e7904845ffa72a9d50fb
font_02_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1