Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f7771333a6efc…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 852aff4a3dc6ee80bb47880acd74c834 SHA-1: 7a8cb596510a15ca554550c3ee19dc202f71f100 SHA-256: f88f7771333a6efc928736cd7ca6ae4febcce348f031884ab0c3737157b302f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The presence of embedded JavaScript suggests it may be used to facilitate redirection or exploit vulnerabilities, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://due.pt/js/ckfinder/userfiles/files/saludaladelofatufune.pdf In PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_89FB4403B3AEF2EF.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/pegosibinesug.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6585c2d1---dodoxezesat.pdfIn PDF document text
    • http://blgjad.com/upload/files/damegadetigabosezu.pdfIn PDF document text
    • http://lovesenergy.com/file/75318294195.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/2330235968.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/432e92d5063c448aea4b365ce81e6c41/2339115280.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/kerub.pdfIn PDF document text
    • http://carbonelite.ru/file/pobipowib.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/kigut.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cc721805d5dc7a54e716e411cd335a81/11178573483.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6f9ae6d3f20e1d69d55b80b6c07efad0/44608650076.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/65616318167.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/vasewezoxajirutegelevu.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/42565128939.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/faxitofaruzazesubikafobo.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/fufavojeruxugezonobubed.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/75457298021.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/43704220417.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/sanopojov.pdfIn PDF document text
    • https://coluer.ir/documents/file/91862682945.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gajafibarike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+only+thing+worth+dying+for+pdfPDF 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_off0000af34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 10608 bytes
SHA-256: 1db4bf7cf9706336ab2cb80c7452d7508a530e0bc0a45cd276f42cf9eaa0c148
font_02_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 15660 bytes
SHA-256: d4a1c950672f91aae598b2bae9228439c0ac34de5238b1c3ee3d2f8c4c11898b

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