Malicious PDF — malware analysis report

Static analysis result for SHA-256 8821ad73526fe207…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 03:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2acfd310b9d7785446210dac101f3167 SHA-1: 1275c57cae362c2ca57e8964b013fe4450b586c5 SHA-256: 8821ad73526fe20755b5c28b61e5a81904392bcd76aa396651cbeaf569da4df2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary function appears to be acting as a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nomylo.ru/uplcv?utm_term=temple+run+game+temple+run+game+temple+run+game PDF link annotation
    • http://minhledtran.com/luutru/files/28506953184.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/20458082753.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd380df41---90458340079.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143035be0053---remetev.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/wefubapijajorakifokuzime.pdfIn PDF document text
    • http://state-lithium.com/upload/files/33002482171.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/67280653769.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/99696046907.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/tifosisudovovufukidebone.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ut3nvurnud6tcaku8lfbunev5m/96739770747.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/nexazi.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/romozikikojowas.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/53911503184.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/42900951946.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161399c896f764---39575132789.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/panavek.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/15230299420.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/61237376892.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/barukuzozaruxuzeji.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/vupaganidegegubofoto.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/jexamebefoto.pdfIn PDF document text
    • https://topupdana.com/contents/files/zakoriw.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/vimowaxoxawofurenifaxatek.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/fomotasanuzuxijidotumeboz.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/53401356168.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/wadazeg.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/3005435907.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_off0000c222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC222 10276 bytes
SHA-256: 952c65efa04fd26e11bf4bbaa070955fba61c718f44467893f31654865b10d43
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 19164 bytes
SHA-256: aae4c5122ed544e352c49ecc2569c7b408a377fedcc5f8da835deb8bb329d45b