Malicious PDF — malware analysis report

Static analysis result for SHA-256 b880d2c802ae01d1…

MALICIOUS

PDF

79.5 KB Created: 2021-06-26 03:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2e84a641b6483d14315c0e1094132c8 SHA-1: 2ec393af13f2d5c2dda3a89b14d528326d6bf740 SHA-256: b880d2c802ae01d1e5432be9e06541959d57b948fcc3cb38c75320f32303bea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading additional malware. No scripts were extracted, but the heuristic findings strongly suggest a malicious intent to redirect users to harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=dr+moazami+ophthalmologist
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2606485b---25545383604.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/321f8acb423a8d75a17f4cab0c7bebe2/90434103397.pdf
    • http://bensonlandscape.com/editorData/file/56714958477.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f178b142d4d4f967d0bc6063f1cdc152/3319679055.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/38675021157.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c085f3254f3---41744165942.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b84c6d0ba---nagukofejobuw.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d2d875b7b3d8decc41205d9e242f800f/98371272452.pdf
    • http://itkaufmann.com/images/fckimages/file/girebezoxufipus.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9a00f15e---pukoluxomukusozufamalex.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d66f4df03---rokatujubatikig.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/o28mvd75q2dbqlavedqcvr4v5s/rosaxenagapufuvizun.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa278afa63---relavaputasavuzuvum.pdf
    • https://dichvuketoanvn.org/uploads/files/63180588958.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/72f7f98eda381ad6c3ed8da59fdf6901/84254806593.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160769e30e2037---junun.pdf
    • http://oio.cn/uploadfiles/files/47536651953.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca94feef98---tefewuru.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608379ded3aaa---42858281105.pdf
    • http://used-machinetools.ro/app/webroot/files/userfiles/files/2116203803.pdf
    • http://chemonova.com/FCKeditor/file/11449973465.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 16792 bytes
font_01_sfnt_off0000eb97.bin
f68d76e4d8b0c0dc68f828fd34bc144872eee71430dbe64d7a942d8c97d0406e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10524 bytes
font_02_sfnt_off0001038c.bin
bca7dad83a1d35f3cb931d62a00af3fbb830829d59b165d45d53c57fa1d243c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 17416 bytes