Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29536f3bea982f2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 02:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5818feb6279a1714522d8e2352ac0292 SHA-1: 4309f9e3d664537a01fe1c901cfd3d270f199364 SHA-256: d29536f3bea982f262af7b2958d44ebe0fb151c4ff6e71cb72c8631c89b019fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and compromised CMS upload links, and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=inteligencia+artificial+pdf+libro PDF link annotation
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/jabamibulogudipoj.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///fipavedenutovakuna.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/bunuvofugugilelewib.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/nopun.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///76355921324.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/18798430825.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/40141621015.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ee6t20docekv6co5dg84aj5hd6/jarobosefinogi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/28b2e80e88356ceb58e87d1aeb7d0b5b/fapusoxubelozukafoz.pdfIn PDF document text
    • https://energooptima.hu/upload/File/vowokofamunaparixoguz.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/60881962866.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bfb0ffbb---wuxegifemirarufexima.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/47123684757.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ebabd6ca55046e9ceae02b7ef017e7bd/xadedenepopek.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210623074339_flasox.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a6af2ae0ffc4c56365107fd9b7147577/zegolejagebiruw.pdfIn PDF document text
    • https://serka.com/serka/upload/files/8829288214.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a12a68d8bc3948d5bdbe7e61a258e63b/13708091788.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5a2fc4861---rimegosovevuzorulofow.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/df2cee3a0c90008d5ed22e9495d28a81/22228671789.pdfIn PDF document text
    • http://siembra.me/uploads/files/85802905991.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/wedow.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/nifilarujemajotosirotog.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 10716 bytes
SHA-256: c2591a9d12c51474ae6c8055a2c245a000b4abe3641ee87d57ef020b2b1baa3b
font_02_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 18628 bytes
SHA-256: 61542002a49ab135766fe99af9ac26df3e017409d6f172f7b52bdf4bfdae5df2

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