Malicious PDF — malware analysis report

Static analysis result for SHA-256 52884a64d44768b7…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 22:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07c3911b97c8d0cedc9ee33d6fcbaa9f SHA-1: c6c997e6604635c235fae77c2883667282c28d87 SHA-256: 52884a64d44768b7be3ad5765aefdf816def89a0a13b263e5f70487326ddfc12
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sochi-polyana.com/ckfinder/userfiles/files/35502103364.pdf In PDF document text
    • http://imi.vc/upload/files/rokaviros.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/wafofu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051a4612a6---kixewolapokota.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/64910548196.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d3abdb8b---88816064152.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/zagemujunakuwusefamok.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/969eef423174af5f8d44d28c1f4ab5b6/13259701691.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76288e514b---bomelevozoma.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455efdd710---79943812898.pdfIn PDF document text
    • http://trovas.com/userimages/dutofoxobanenu.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/besegowidelakuxolaki.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae723b669---majasek.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebad9244de---gekotifafibenemafek.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b33fefb68---73679943343.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073307587286---dojaro.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/pitalenuxewezegodub.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vurizi.pdfIn PDF document text
    • https://motiv8workout.com/up/files/60189128759.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc66abe4c1---66968694837.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/54513139676.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///rawawojujadedenuk.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/15506078580.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d8a9622374b79d5336f865cb47f0a647/80965354699.pdfIn PDF document text
    • http://splogservice.ru/content/file/pawalunefabopuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=song+of+solomon+chapter+10PDF 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_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 11084 bytes
SHA-256: cfd572dc26a044fd20e8dec53cde5b0fdab2d9713f4ba8217beaa6d42f021e15
font_01_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 17504 bytes
SHA-256: 51745a72de534923e6ac42b45ec90c3c34a946e423fd4c759c5f4ffa0d016853
font_02_sfnt_off00014480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1