Malicious PDF — malware analysis report

Static analysis result for SHA-256 da15551b0aede163…

MALICIOUS

PDF

101.1 KB Created: 2021-07-30 12:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2da3fa1b73603d7cb1206d963bb7cae1 SHA-1: d70e1b95f92600818b4552f175f9d627f863f9e9 SHA-256: da15551b0aede163a93c1a1bde5d0c1618ea2fad3dd60870b38301b51f8cec07
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b923c73fc---betitadowurolorajuwuj.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25a2d7501---salevavex.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/2999985943.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/16220403292.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22471791089.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c589142086a---vudulufiwewe.pdfIn PDF document text
    • https://arerp.kr/data/file///43124837695.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/63950803932.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe1246994---19820912526.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bbed59259---guwedinawufosozowotupuwip.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/23147408928.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853b56f1a2---67943987017.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4fm9taqj6t1ekui51ua01ll16f/degurana.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/fagezaxozod.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/1549802284.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/78255554723.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/44418103113.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/003693d777b93846768bde33483167eb/jisuvikosapen.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///28605085934.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502205218405991310.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/92916001832.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/jiwurazuxorapeju.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/31efd8c676332fba58bbe8ca447a3e55/doluxofujovezumogaxomus.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210713150349.pdfIn PDF document text
    • https://agatanorek.com/files/file/51399852882.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1a4ean5krvgkrtt2qki55ik7v1/wilovev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=java+code+to+send+http+get+requestPDF 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_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 17848 bytes
SHA-256: 23ad63fdaf73c5e79b5b3111123e17228ce3f54ee4dd8acaed1805e2f1882583
font_01_sfnt_off00014c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C92 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_02_sfnt_off000154a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB9 10960 bytes
SHA-256: b5e0ade0ad67d0621d7f17a27b4b7c8d05824de59c8af8f7aa694654d7f8b7dd

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