Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e2ac3370c30f4f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 15:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e05c6625832d24d1d33d99289941b56 SHA-1: 9d4681f987918399e7507a018adf7030029afe80 SHA-256: 48e2ac3370c30f4fec5351bbebc80ac528fc21b4f66b607b5aca48963f3ced8c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing software, a common tactic for phishing or malware delivery. Several embedded URLs point to potentially compromised websites or link farms, further supporting the phishing or malware distribution theme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9cc181f57eaf226436e525376aace5a8/78163456208.pdf In PDF document text
    • https://farmacieitaliane.com/documenti/file/perujunowoborunuvatito.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16147768b318d5---xiketogaroza.pdfIn PDF document text
    • http://shopabrang.com/images/files/nesitijujamejuxavifita.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/tudizaluno.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/wowebibiwim.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/39752142668.pdfIn PDF document text
    • http://szjg.hu/images/file/wegugoxokofinigajobi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6b42e7177482817a99caddee997e3e1d/xogusadogovi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/649f393eb24abef519f9c56ed18ecf9c/gavozevarexewo.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907084715.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/mupakonasemunedowizajifur.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/43613944545.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/42692187181.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/92411239947.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/biwase.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/ritulanemonaguj.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/petolidonimodudeluzuk.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e2fcf7187aa54ad64ddc031114ead1a8/sanano.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/84705000170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wtyczki+chrome+na+androidaPDF 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_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 17628 bytes
SHA-256: cafd918fc63401eb2349d35f111f190ab0c3c5c6df807a71df8e174d8d46973a
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 10680 bytes
SHA-256: d222610d63523125c1da394e1ece5f2dab916c0d724b0844f099bc3f312e1430

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