Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5da6a8b27cedc22…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 07:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e0616392447e756274d64ddb145b6eb SHA-1: fa773313d4d36080b981e5b8647849e5934760a7 SHA-256: e5da6a8b27cedc22def044143e4f4129c4cb6f40a9dd68a0be303f459e76fb4c
164 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=sony+playstation+2+android+emulator PDF link annotation
    • http://hebammenglueck.de/ckfinder/userfiles/files/79234373545.pdfIn PDF document text
    • http://reichspfarrer.sk/file/nipafepugibipizud.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/xejexilodurafejiwadukojab.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28144156523.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/wekerupivewesiwezuvibu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/niperebepujojapagogegaj.pdfIn PDF document text
    • http://rs-entp.com/upload/file/bujomuretosaxolovegar.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/68110786415.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/45093987018.pdfIn PDF document text
    • http://birdwatching.sk/media/file/91993446130.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56220190014.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/35477680144.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/xupogizewadezotinilukewix.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/29650459935.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/744057375.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/04583db868d8ff433e249fb33d2e5e4f/85707339758.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/38ea54a3f7a47befcf454eeb654263fb/sexanipixupajej.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/43228585852.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/numutoxakitesiboneme.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e716e8023a120311a6b98ff6e87d4c95/pisuki.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/maxowifuxupozobanapexugu.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/29300434011.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 18564 bytes
SHA-256: f1fb46ff203525e8196d9a214b22c6b7f29bcef5ba5e33b9635176717c410963
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10964 bytes
SHA-256: 8f51bff0a2f02b1e4d91df75b401a9903a294a5e42d392fa0271c012bd6cbb14
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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