Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceccc4c40cb60f72…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 05:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c57bb96365f7911d69349fea2853f81a SHA-1: 160bfb8bc3b5a74b640b774b5cbff81e105fc8bb SHA-256: ceccc4c40cb60f7297dd8b68f15cc388af1db943f2ed943b61b2ff904f738955
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded content are indicative of a phishing or malware distribution scheme, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=cae+exams+pdf+with+answers+2016 PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ffd01114eb0058d701d28ea35ba7042b/baxadajabumomelexawowesi.pdfIn PDF document text
    • https://curvy.tw/upload/files/lakirikojozasuxagom.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/24334928507.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99b8f3551---jujuz.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b30a73a5---14919587583.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/ronexeme.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/dubajikurufobulivo.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/79334686133.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5d29ca7fbbe02239b09529746952fbe5/mipojexex.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210827160603251997.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/83748374174.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/parafimadofotiwawonur.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/79569654230.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/14428585300.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5b851726a3543823188518b77380bf20/dovutidaluxujidu.pdfIn PDF document text
    • https://keongracun.org/contents//files/15617606854.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a0a74015---70281278123.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/190245141927.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085115b333a7---pipidapepewemuto.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kogizakosejedamino.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/jizitexidi.pdfIn PDF document text
    • http://rayanchem.com/d/files/81764749390.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/felozawogilirati.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/73556957049.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/68e282cd5555c06eaac84d7a480c5f9d/fisonev.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_off0000bf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF49 11276 bytes
SHA-256: d5da4a85a14f627d97d259cd6259b3c4b0f8518a808682ff6dc89a7dc2377842
font_01_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16500 bytes
SHA-256: 452848d7ad3f983ff456b34118139ac1e5c4911bc84d64068f2a9113663f5a77