Malicious PDF — malware analysis report

Static analysis result for SHA-256 630794d38e48c4eb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 04:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c03ef2e91112af0e0f204d8376665b66 SHA-1: 37902f8f04b18bcb5fb6825f4e7eedfbe0833038 SHA-256: 630794d38e48c4ebe63da861c93f26dc5cd7910e3223f4131f1abf574334ccfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to a variety of external URLs, many of which are hosted on potentially compromised or disposable domains. This suggests the PDF's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=dont+breathe+1
    • http://standdominica.org/files/files/xuzurixifukomafijaz.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/85744380250.pdf
    • http://hani-bee.com/userfiles/files/78812411519.pdf
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/kupuritoxam.pdf
    • http://alarcon-v.com/editor_upload_image/file/tavowuwumezedijem.pdf
    • http://3bbb.fr/ckeditor/upload/files/6113173393.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/152b1bd24c53f2abb9ca4c371c346125/naboborovaden.pdf
    • https://prawobrzeze.info/userfiles/file/80447496933.pdf
    • http://makesomenoise.hu/upload/file/49704427357.pdf
    • http://teamhead.net/userfiles/file/33229668322.pdf
    • http://pmrs.ps/userfiles/file/pelip.pdf
    • http://kidzcastleschool.com/singhania/downloads/file/80627656767.pdf
    • http://dienlanhhuubinh.com/upload/files/56712508308.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6e84edd5927e9db11e52dd5034c0bfe6/90061163071.pdf
    • http://spain-ex.com/images/blog/file/56955608114.pdf
    • http://acelybio.com/upload/files/44228568149.pdf
    • http://ladyqueen.it/userfiles/files/veralizajusunidibusami.pdf
    • http://hyunshin.net/userfiles/file/79940847563.pdf
    • http://farmaciafasolis.eu/userfiles/files/49116357821.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d2e401ce---zomago.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_off0000e055.bin
77e8c4553331b9107ffbea7db5d8a016edc1073053cc22ca07f8b8362571086a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 18548 bytes
font_01_sfnt_off000110c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 16792 bytes
font_02_sfnt_off000128d8.bin
2112a8584f1aef343a27a94d355e00af0308ee8c9a42bbb117baea1ba7df0b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 10092 bytes

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