Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d877e3020ac086f…

MALICIOUS

PDF

96.0 KB Created: 2021-06-11 08:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8c0e1a5838a4af4884e120227900563d SHA-1: 339c4c2e1e0af775bb04d9045209727925ecbf39 SHA-256: 0d877e3020ac086f475971ea91d31938318b2715303496028b4df63dac260ee4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of 'utm_term' parameters in some URLs indicates a potential SEO poisoning or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=allu+arjun+latest+malayalam+movie PDF link annotation
    • http://asiavent.com/UserFiles/file/%5C/wipugifolibupalorel.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4o3ui5huj498nerc1ffm3a11p6/82759320119.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bca741c82---28729735480.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a163c06729---82995957818.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842a103f8c---11243487969.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b906bac09---mujut.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc57154ff---31995604276.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9f721340cad675f3e014e5578c983528/14968604285.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/luxozefoke.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaed592afd---redileropitofokikame.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/56764018080.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/gerebekevuj.pdfIn PDF document text
    • https://susta.vn/userfiles/file/soxutalevogunasimexuk.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/08d207b870b135f19431f193a1a450fe/jumesebiwobaruwitimat.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/01338abecbf67b1a3e7796ab7c1ffef8/tiwagoz.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7683fed049baf7aea4f5a7a4063ef6ab/tanovalepeneruvimaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn 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://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 5060 bytes
SHA-256: 4a25aaf21120e9aae9fe3ff5be01e0c195f5bfc11152d72652f3b28571737489
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 2496 bytes
SHA-256: aa0965b8fde1e9430945d1b84fabdbf5186317ab63726bd16a9b2d99c3e6b2df
font_02_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 2664 bytes
SHA-256: b8d27a24487cc5e4814f9c93cd605bd530436315a3e232ce5ead7fe3b39422ff
font_03_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 2188 bytes
SHA-256: d45bc6bb09a91a0e448bcbf6abb81157bd511fbb93cc900b67a5d0a9556b79b6
font_04_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 2116 bytes
SHA-256: 9592417ef71da2460b8e603ce3b2491b639d3fe1a868e0a14fb776ca7991d72f
font_05_sfnt_off00012b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B15 10880 bytes
SHA-256: 0dfdf82b3c26d7117bbce618ccba25a7107cd3db602b1064b8265eb017e29bbd
font_06_sfnt_off00015085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15085 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_07_sfnt_off000165da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165DA 2564 bytes
SHA-256: dce314a73ad01bb062acde597f234c47679a83b3e051224ff066931698fa8fbe

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