Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4037f3a95e1f0e8…

MALICIOUS

PDF

86.4 KB Created: 2021-08-21 14:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 98f537719ed3615d1a0498b8509ac11c SHA-1: 329605166d373c0f8bb9a9d7f7accdc4301f101b SHA-256: c4037f3a95e1f0e853d18bf33710a489070230718281a7794aafcdc9309adc07
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of external URI links and link farm indicators strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://irlanc.ru/uplcv?utm_term=%C3%A0+deux+m%C3%A8tres+de+toi+pdf+google+drive PDF link annotation
    • http://stavclearing.ru/upload/files/2180306117.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/seburalusunulut.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/65227380996.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16074487718c64---dazesavela.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/42210762809.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/lovuxoragewufekuzupofekim.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6eaa78439---davogizokosiwimofim.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2fbcca9c6d462a9abc741031e39ad7ff/wololazijijujepefexodazi.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/bofedifosagij.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/78869391536.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210729232821.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720939c50ad---muxujudemunegunawu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/cb44f3f4cdcd5ff490f28eeb5aad843b/fidudi.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/17826250105.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/nazewege.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hqlcb1q81pmv82q8ojkhc6gln0/28219469402.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e01ed5cb1---fukapedegemixuw.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14b496875a4379be51509a697459c41e/7552231660.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9a4749087f325e78bc6e16aec71f2fbe/38857701173.pdfIn PDF document text
    • http://getem.eu/files/file/64432761958.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/73160092235.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/33412823480.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/49749166479.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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 19408 bytes
SHA-256: 7cdf72a56fefddc73123495245acea9920a9734109f9b0376e8bc31d6bd2e686
font_01_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 11000 bytes
SHA-256: eb977d43fc6eacd9dc76ea9fcfc6d3d637a3ab82697ffee9bce13201dd527c78
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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