Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa400bbf5c99ab6…

MALICIOUS

PDF

89.3 KB Created: 2021-09-19 17:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 66b351b1de134bbf6ebf5c4ce2c16806 SHA-1: fceef0377ec1683e93354f4c4ab508b13e135bbd SHA-256: 3fa400bbf5c99ab6ea5ab87f4566c4f70608808f3ea27557aba41dc8ec75df5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. These links form a link farm, a common technique for SEO poisoning or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://3q1p.com/upload/file/210913183734148502fhdaew5s2pat.pdf In PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/1662036262.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/xovutoxakufamebaxizor.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614692023b5e9---38731532246.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/peresokupemunow.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/fifufojuvit.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/vinepopiwebesibulidatil.pdfIn PDF document text
    • http://lovesenergy.com/file/14407382316.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/39819867315.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/rijomupis.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/16928104165.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/pumuvabojukonutegopumox.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/65549801022.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/robuwesemo.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/wutijatulopusobu.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/manipevetevixogisigupu.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/bemarak.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a186db07f8---xefojine.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/38189831375.pdfIn PDF document text
    • http://kaies.net/upfiles/210904075324399134imlf2u.pdfIn PDF document text
    • http://allasclub.com/campannas/file/8739435018.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1614765825f325ca8f3054f6196344c2/zasibedabelijari.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bimefegezorur.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/54643334169.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/19027506119.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/muzamejenuzefavizavedi.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/15821162660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=central+intelligence+full+movie+watch+online+freePDF 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_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 10896 bytes
SHA-256: ae7a8b2737cf252e244243da0b35cd6be21d0a6b01b50f457d4bc6bbc45d0068
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 17596 bytes
SHA-256: dad10863188cee29ee3b9834c7d818f1813342f94bf006a818cc267b22a1d2c9