Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22b6fc393369080…

MALICIOUS

PDF

96.4 KB Created: 2021-09-19 22:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c40becb3b717053b807f63499fb52c9 SHA-1: 46f38fe7234d4340c9e5c106272e377659b286cb SHA-256: a22b6fc393369080ee6fd6b53d5ebaa9f0dbb2714f8a46771141a921b84690fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/rawisipidelewu.pdf
    • http://canadanur.com/resimler/files/bixavuvobevepa.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613061641f938---jodudukag.pdf
    • http://watdoenwevandaag.nl/upload/zisegokazedezuwirefis.pdf
    • http://denizyemek.com/images/fck_upload/file/josipe.pdf
    • https://0a3exp.com/upfiles/editor/files/43590911501.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/gupebesapesitap.pdf
    • http://rfychina.com/upfiles/files/16308892679246.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/24675712595.pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/34631008695.pdf
    • http://szigmetal.hu/editor_up/43206785567.pdf
    • http://rileyillustration.com/images/agency/files/31658085939.pdf
    • https://sikahaiphong.com/images/news/files/ziwisupunezus.pdf
    • https://weilmclainboiler.ca/fck_upload/file/peziwofuselavibob.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/11824644689.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613805f13eb14---75429818690.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/dolenadurefu.pdf
    • http://tamtamphat.com/upload/files/vulijalijibuk.pdf
    • http://azizavacanze.com/userfiles/files/70619969686.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22cadd562---jitoremuzotumezajit.pdf
    • http://augustaelectricalwork.com/editorData/file/5786314729.pdf
    • http://nato-denkmal.de/uploads/file/47161508634.pdf
    • https://archielectronics.com/userfiles/files/natukasilufukikisevu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+emotional+intelligence+2.0+pdf
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/49042072056.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_off0001108b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 16792 bytes
font_01_sfnt_off000128a2.bin
be98ee498f821c9b83902a87d3c505257746632860b701ee3c8e7ad7ab1228f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 11092 bytes
font_02_sfnt_off00014252.bin
429a6610b2dd69f44b9179fd1c3c0a9e67f49181231ccbee5e19cf90f6a0cd1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 18976 bytes