Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d04ea5a5c07ee9a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 17:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea249445f5673866c65009976e05d316 SHA-1: 39215fcfc2b514d579c5a10fb4375e866fb1232a SHA-256: 5d04ea5a5c07ee9aae92d225c4f35a46adaf035422cdf7b35c6b6ca7b61060a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=does+android+have+bluetooth PDF link annotation
    • http://snsi.jp/image/news_file/49723643559.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/fejapopasujokivemupuga.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/ketabufamid.pdfIn PDF document text
    • http://getdol.com/page_data/file/77480510420.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/74997844043.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/gowejajojigavibulefuvota.pdfIn PDF document text
    • http://imaginove.eu/data/Files/88416573620.pdfIn PDF document text
    • http://52963566.com/upload/file/202109102237516954.pdfIn PDF document text
    • http://ebus.cn/up_file/file/fevubugumodixubipete.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/jekarenoni.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/mejigilukugol.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7aa4bba9---82304475333.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89a10729a---94590847081.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/rubuxigolijibobaravijite.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/sajanerawutegakapolupeza.pdfIn PDF document text
    • https://wittnebel.dk/file/67571659093.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/jezivejewejisoru.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/sevuwixamobepipel.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/84716363134.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/97827110941.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/fewakogasaxasekanegevare.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/megekaj.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/46495892132.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7rlhe1c5iasu25334nef3620hi/37872444546.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/80089401881.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5k4cv5m7jj39gp4mc0hdiononq/depiwipavoxupuxozalife.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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 17848 bytes
SHA-256: 7382201998f5f987d4f18c508ae0cf8d15ee60954193a909c17972016cf33c4d
font_02_sfnt_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 10652 bytes
SHA-256: e6a34b0a157ba65070a38bb4fbbc1c9184edfe696c23cf942150a5e47c52022a