Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fc8bda4b540f6f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 01:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48834f04015600cb23b2fe7b4f85c264 SHA-1: 8a57f23ee8f795f9f63f80a23e80fcbcab079e3e SHA-256: 98fc8bda4b540f6f01b5782734a722bd514cebd98b04803cda87273d83740438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body, though heavily obfuscated, appears to be part of a lure, possibly related to 'Salesforce interview questions PDF', to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mimpiindah88.com/contents//files/lukadimegeketasizos.pdf In PDF document text
    • http://thepducphat.com/upload/files/luvesujofulijowigudexidex.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070403512888.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/5167227098.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/junulexogevude.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a9b576228c6747ddb0ebf1fe51295e87/mojarisegezegozes.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/dinesuranakume.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/49982526181.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/62966552504.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ffs4v1q6mdooeipq9cs9vv9bh3/vunujovuseliniborum.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee215d5d81e---68917758735.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/68224422033.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6806398109e82d7786d740d5fad3b5e4/jedanimusubogemubuj.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0aff069a96ed198a726f9171bbb03ba3/munetebaweratofaxivuwem.pdfIn PDF document text
    • http://bscartridge.com/pic/15574060566.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/junepinoniresezotim.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a8b4696e318b39fac874fd745fa832b5/23472977930.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/bidisojefasidinos.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/tonavogapino.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/21783182775.pdfIn PDF document text
    • http://tfforming.ru/d/files/joxibijijijemesudag.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9db2a2d3a---12134720897.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907a7eb73ab---soluxisazifagijapiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=salesforce+interview+questions+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_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 11088 bytes
SHA-256: 00f8d9cf49563a08fe7a40cc4dd5e0e9e187a538c03eaf98151d644b9b2d0a5e
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 16568 bytes
SHA-256: d7f4f6eb1b0f7454b64db0dd0c827813814e638d61098b66b87d8fe53f0741b7

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