Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9cc4a075f86507…

MALICIOUS

PDF

86.6 KB Created: 2021-08-25 12:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e68d07f89e9ec68c798c4e81edfe28eb SHA-1: 8760ec259a5769acde72ba9a7dfca2deb83b867c SHA-256: eb9cc4a075f865070efefa7dff478aab9f9019d4f16db413dfbe9760f7e1087a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous domains, several of which are hosted on potentially compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://les-dvorik.ru/userfiles/file/kowijoroxi.pdf In PDF document text
    • http://abwingscolley.com/uploads/files/kuruxe.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jofavafedobegozaferafupap.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606d101aca070---pusoguw.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/fejenitudalujisoxed.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vopjf3inav35ganl3nr7idrhc5/64957768974.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/wabadumageli.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202108171328504947.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/74408605192.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/46847279134.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/safaworaxufavepifonotoro.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/frhn6uiqmkpabqgvdrfdn5vt0i/32021378026.pdfIn PDF document text
    • http://immopolignano.lu/images/24001447873.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608872b05d0f7---wakigefebodozifibenufivef.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/39235867762.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/tejotunovukobe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2686d136eb---semutavasebatokedigubewif.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/sibuzad.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/78257062993.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3d0e652c---98529986632.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919723a5adc---jivizuvevuwa.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/piteruwopavumibefeluweja.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106336b1bdbf---xupovizadefute.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vupobuvajofedekazosawozen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=it+was+a+dream+lucille+clifton+analysisPDF 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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 10888 bytes
SHA-256: 3d9819eec1405506959c409446b09e4735f07f8b43ffd4ef6748faad4cd57bed
font_02_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 15692 bytes
SHA-256: 2ddb2f6cae48366a6231d45cf852340128ec559d4cce4e13f2d44c86e4ad3ad0