Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d9bcb17a5f9385…

MALICIOUS

PDF

74.6 KB Created: 2021-09-30 12:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 563d4c434bdf52c39602d7e768d067f0 SHA-1: 89ba324f53e8f80145bfe5c12ad903059a73153e SHA-256: 53d9bcb17a5f9385aa0a1ad2454cbc87cdc256e092ddb03fa80b2a5e3a516a9e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bedandbreakfastchia.it/userfiles/file/37728731394.pdf In PDF document text
    • http://195exim.com/datas/files/66399405519.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/60513295208.pdfIn PDF document text
    • http://dasbluemchen.com/20395485968.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///xivelakonejedowemij.pdfIn PDF document text
    • https://apra.pl/files/file/robijab.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109042313215842.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/52716461254.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/33088714703.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/88925219954.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/58296348085.pdfIn PDF document text
    • http://citranco.com/users/files/gabapig.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/72807031662.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021927_74734_483.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fd5e6050---1160681872.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/80812830547.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/79896194027.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3de687ddf0f4b16ef86b0966ecadc39d/jugigexalonotinowiwapa.pdfIn PDF document text
    • http://synhbio.com/upload/files/judilagex.pdfIn PDF document text
    • http://jawarakreasi.com/file/xulul.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8aecb10e6---navebadopubojaruledasuvuf.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/woxikisugimenagawut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+transfer+files+from+phone+to+pc+with+usbPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 20108 bytes
SHA-256: d04534ea3ca268a381384584c15775f653be6aa58cd4b9de1f60249c6a3d2b91
font_01_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 11064 bytes
SHA-256: e33efa9154e0a567e3b48a2766d919cfa17f1a75f2499b7988c715740778ed60