Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcf39f46a87bcca…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 09:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5687a2de54a76bed371643ee57d84d0b SHA-1: 3b8b1643e7177369cb7e506756351a8e04735e27 SHA-256: edcf39f46a87bccac227366297f5b95521a945103922996fec7f50db4f4249b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=i+am+very+busy
    • http://127.0.0.1/kardelenemlak/upload/files/41109117896.pdf
    • https://gachbinhduong.com/upload/file/86299731136.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e8b1d9e64---motukig.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d488de81a66---wumeva.pdf
    • http://wagnerpc.com/userfiles/files/sogiloginugigukiwi.pdf
    • http://meble-tk.pl/userfiles/file/nabofebugibax.pdf
    • http://alphasigmaoverseas.com/userfiles/file/6232440594.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a6a13a91---88135134988.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/664730210344e0fa7d072477a50d1e80/36191231885.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160add7bd0fae9---xotuvanujobazaduwufiliti.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c720fde1858---40575435155.pdf
    • http://okmarin.ru/userfiles/file/fixidowudufurosogafupipa.pdf
    • http://msiutilities.biz/documents/sawonasasavubugivovepimiw.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb8d559f6---41083777541.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d5ec2d8c---5376239533.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f522074ef7---69924122571.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/0bb476c1bf71073a04bfb91aeca7a87f/wawogumofuposa.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe188c4fc---fejunevomol.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2eb9608ed1d3145df0b00aaffad29498/5143564285.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806213503a4---13481716302.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0bf3f96d---17115530273.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2bb7e895fb2c88d04b129b903cab846a/47775522913.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb2142420---96198476516.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e0b795d0581865ad7fbfdb44cdd3b898/netoxoka.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a84718e---pojipunolima.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_off0000f665.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 16792 bytes
font_01_sfnt_off00010e77.bin
a1e9f8239b610963fb47daf3230d1f1916fd78958cb8bda410623867cc6b8a4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16944 bytes
font_02_sfnt_off00013a18.bin
ee3de7ab8cc9f7c5cc68a2fd544fca3da70b03a8af98a6dbf4b1c3f468382aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 10180 bytes