Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bd96615eb52543…

MALICIOUS

PDF

75.4 KB Created: 2021-08-15 03:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a968a2c7d986e7dd554a31ae011eb8c0 SHA-1: 2e2713d24e127ac0c1170c8f94ac6d20e6556d8e SHA-256: 30bd96615eb52543d8dc4ecd5a582bb5ada712e01b4b812970272f349a9608c0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing numerous links across various domains, some of which are hosted on compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution scheme, likely intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/7c848c5b6b342a2c8306cd7cd18100fb/99688463246.pdf In PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/pewosenuru.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/xaxibomojoxogofizaka.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/6371697639.pdfIn PDF document text
    • https://ka-base.no/images_students/files/70845277698.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5eb0e894dbb7561f47b69de008d1218e/naxikujadixaragane.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/51262836108.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6n3onsca1l33vf6oj4rtcsu12/26096387482.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/vakomojotozumiwiniwoxolaf.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/79388851231.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/ledinibogajozogi.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/3628559035.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/xepowevizatukaxokofoletap.pdfIn PDF document text
    • http://www.celso.org/download/45191054518.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/81360163438.pdfIn PDF document text
    • http://mmt24.ru/files/file/20659962630.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/pazomuzinaluluxagejibu.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/golevogojipegabaz.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/1284625167.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/pozerarigaxila.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/9620532848.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b529225d01---54415119360.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885d5bed321---dawirevuguvovumeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ezel+dizisi+jenerik+m%C3%BCzi%C4%9Fi+mp3+indirPDF 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_off0000c021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC021 11036 bytes
SHA-256: a689ec1cc5ac35d0bfe298e9772955f4afa0515ac237ddc5ee0359cf55e06169
font_01_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 17372 bytes
SHA-256: cf76cd741130d6d5ce9de632e0842754f6a63c96a96561fdb702519bf11b9285