Malicious PDF — malware analysis report

Static analysis result for SHA-256 3018acdec34129a1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 05:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db48c66d9a0ea02ba8dbd2c213fb5df0 SHA-1: 118d80b2a64bc4dc0f577ae3eb7ab0b4f403ab07 SHA-256: 3018acdec34129a1f745fb256f4559f7b144615c5a27e59a6f9d9bdf567e8030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://infrive.ru/uplcv?utm_term=area+and+perimeter+of+2d+shapes+worksheets+pdf PDF link annotation
    • http://iweldbot.com/ckfinder/pho/files/52856940412.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/difomiz.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/lewamifetonomivejesuva.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/24145921812.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/j2m5402q5dfq9tu2kmuks0cgfl/72754787895.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/94913690092.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ccd011a---nevofoxevuxinene.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a656c72ae---17983138707.pdfIn PDF document text
    • http://funperm.ru/content/file/jebajodozikusupipifasuzag.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/pivetisifo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/kfcavpo8al1kfrtia5ds3afn0c/wukujolidatefupax.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/96904286443.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/3415165965.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/zijopebigivajorofitej.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/xibewofipovafedubugifavid.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f84d715c18---52576996249.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/88343348450.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/89682957626.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/waxokegupujezutobuluxa.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/4482521286.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/83556867343.pdfIn PDF document text
    • http://odumakus.com/uploads/files/15133058759.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/355982fce2ec9c067d1ed30e451284f2/42024556022.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2b64396b---pubokazop.pdfIn PDF document text
    • 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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 17056 bytes
SHA-256: 411d62f2a0d424d3f28a5e8b9d2747f0caa7a8d188f658b623e109f6e8488d24
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 10996 bytes
SHA-256: 5e463c699baeaecd6a02f9aa2e46d985339811046572c89097bf185e4e989235

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