Malicious PDF — malware analysis report

Static analysis result for SHA-256 31672a635ddc3a49…

MALICIOUS

PDF

82.0 KB Created: 2021-07-01 22:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bf1079e7f5bfd0ca3c32f78dcb59c894 SHA-1: 61cd3a85b85113ebcb05ad275c36331cd6069215 SHA-256: 31672a635ddc3a492edb81d5dfa49d04d19072e08adac2fd9b7c061234dcd3f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=cell+cycle+and+interphase PDF link annotation
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f8fa392e800f0134badbb3a428fc6b05/savuvexeranu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/devabisasiganol.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/pasademonebina.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65bdc21783---nuxogegijowi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7478b04135d8b1c3d3f49fb2e68881aa/sabajewufejimerusewizi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ce8c334e315dde612cc826ffa796ebc7/6430390795.pdfIn PDF document text
    • https://limsurdua.com/contents//files/84901693202.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/23688061893.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/15651076892.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/rerokabokezomirajobagiro.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160944e5c14bf5---rutok.pdfIn PDF document text
    • https://x-software.cz/data/file/jujefeburegim.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jizebebixuvilawuruvadom.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/piwaforabasefexenu.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/1866447469.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/la2l68adrnfi4nmh1kjrutdbcs/57795272680.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/hiiu4mmlnt88moa3ilu13fq0hr/96906816122.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b769ced2e---fopujuzis.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a782d17076---35355801797.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/xawujomupajo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa614427bd6---12759886144.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a09e54fbbade8d8df5098b2e0509b522/33136978088.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/281733999e12ec68d00b64eec57a277c/guzodimafi.pdfIn PDF document text
    • https://mmszke.hu/files/file/15777158915.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/nuruzazuxemo.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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 10636 bytes
SHA-256: 7f88d640984788eb7edd067ef37e37dce4f156562219b3185a8ff5eaafc3764a
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 15784 bytes
SHA-256: 6a9fdaa146526f721bcf1b6071493abf1e8d1c8c89f51f18b6873202d282a583
font_02_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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