Malicious PDF — malware analysis report

Static analysis result for SHA-256 989822c9dc9622e5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 15:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5595489f8310d2b39aae99354103662 SHA-1: 1d53da26b7a573f2f41523095c12f6dbb10da1a4 SHA-256: 989822c9dc9622e56575da0dcdec14c34a7b11c9391d1ff5b4b2daae5dfa6a8e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613767eb30ce4---28741766009.pdf In PDF document text
    • http://macierz-grodziec.org/files/file/juxipizorajujesisav.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/64361633493.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/webusiludonuparoxipezufuf.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/bejuxotewosefefawu.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/13599945871.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/59356313671.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/pedefazifo.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/56993243200.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/68732492193.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/210a63f7609ebeabf07418a0c85aa9b0/86386588696.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/jebipipifefaso.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477796e241c---52138994938.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/51618910926.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/rawazorope.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/27804640078.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/takape.pdfIn PDF document text
    • http://client.diffuse.info/files/belelikulakegerupibusi.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zenigumulo.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/32751227686.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/89803451608.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/71128660240.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/36196649167.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/miguruxinokugefu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/soxubeziworove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=undertale+multiplayer+androidPDF 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_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 10608 bytes
SHA-256: 2d1d12a0b440dd5b30b8af120e5b878d9b6d2d4c8b65b4d0eff8bd8d52e5c73c
font_02_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 18256 bytes
SHA-256: da0f481b9cce0de708c49d1e4c19090d92dda6a2cfd1f3d13d6e86c68d5c7b99