Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6611f9600e4c4e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 23:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d69395fa555ca6ea15d503f2e082dda7 SHA-1: f4b97e1e91f133ea6f16c3d957b3f42902348726 SHA-256: 0d6611f9600e4c4e798b606be20b165ee3f4e313ec6ffd4051239af395f58516
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and links to IP addresses indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gionggiacam.com/ckfinder/userfiles/files/60418038770.pdf In PDF document text
    • http://kpotplace.com/uploads/files/81693949117.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f6be932e51---zewoxogazuvumavupu.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/woxugepotodafizo.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/1kbsk2ug1ofuskbkvjmlmiht9q/19705665108.pdfIn PDF document text
    • http://anm-av.de/uploads/files/fujevij.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a85c322027ce663f8b74eb6bc6b23c70/migiwejatobufures.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/56439836014.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6150058e1dd7063c27cd363da4f19ed0/56943611105.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/galira.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/15784488432.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c750062d24843a50d70aada65304013c/34761876560.pdfIn PDF document text
    • https://strechybenesov.cz/content/rifajedimirufox.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/xolosupovegegotowejadevep.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/lonowikibuju.pdfIn PDF document text
    • http://dogable.de/userfiles/file/kutumekoloboxob.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092173ee2a91---jibugodebuwazotite.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/df68fo5bsbhhmr4qs7d0m3tnp5/81753107966.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5o869dj0qk3eesnrouipl04nn7/widapedikidolakopavuwugug.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/xorosopamabesep.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf739797a1---63670911290.pdfPDF link annotation
    • http://cnokorea.com/userfiles/file/43626925280.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/vuzelebetutaki.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5ac2f04674b19f933903aaef2cf3e611/57588577201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=visual+basic+script+manual+pdfPDF 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_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 10736 bytes
SHA-256: 779ce7411880cfcfff7ca9e4fa9fd6d78586de1bcb4b7cf069656b963a8e77e3
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16056 bytes
SHA-256: 55f2bfa0b50597253c8408c4e7770745061fb9f98e97f7594725eaf35574364a
font_02_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1