Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a33a9b4ccb4dd1…

MALICIOUS

PDF

95.2 KB Created: 2021-07-22 00:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46d3579c6d67671b39a080b22cd27dff SHA-1: 837a1ca50650e00f0a420ea74bf6bad321220d71 SHA-256: f9a33a9b4ccb4dd1f365e48630f39657d6e00030afbd1d3ce3aa7aac8473a3eb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://alkalacarservice.com/public_html/userfiles/file/19469705083.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/31a94cd272c9f8d27d3cfc1c9ba0a98f/7988180397.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2841e163d4---48532285025.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/sofakenopameke.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/10948595253.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p1gb32rolgou76hvl3fqqjjs5m/26577999142.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160741c892e5dd---95394969661.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdefb202c5---39463980869.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/pumalufuk.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e0jcatr9k1fi43q4tu5m5m66va/fanubexalidobenaxoj.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083821350857---suzefoxodonawobidepokiti.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kuxoli.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/efeb87c8b74cbe713bd99f310bd81fc4/kipilufipowapodapibetal.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/noluxolel.pdfIn PDF document text
    • http://momsystem.ru/public/file/35212322448.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/pumuvitumagovezomedonoki.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5eb69d2c---xosejovitidudilitinoxetes.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/32542737435.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/wolaz.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/lopofalujuluguropiros.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/lobujan.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d64b244bc---rigonoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=super+mario+odyssey+bowser+fightPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 17732 bytes
SHA-256: 9bb5327272886f20ffceedbfb1128dd4c2815af3185519c1b545bc4144e7936e
font_01_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 11312 bytes
SHA-256: 75e9f5fd47ff92a3780f7eb05f9d1784bc6ed867a979000d5bc7409d47649679
font_02_sfnt_off0001402e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000155a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.