Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dae01782278b25…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 08:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce6a7bec5fd10b8637fe06ddb02b9d8a SHA-1: 75e393d7a1410a6be213b63bb78beed3f3e44c96 SHA-256: 81dae01782278b250eb76958f5cc32b9ff6635273e12308c4616aefd1adc6719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of external links suggests the document is intended to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=fortress+besieged+pdf PDF link annotation
    • http://soldearenales.com/galeria/files/98916371098.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/revewevabuvusogute.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7f573d4d200025ec21a5de49a9f759c4/mepamopox.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/59abbe186aae2814db2c78e52127fe8b/9891971000.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/93455528694.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092768cc3a4b---sawigipowetajojav.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/xevonefatekiriparafifafek.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/tideganixijuvukukifekapop.pdfIn PDF document text
    • https://kawanmto.com/contents//files/famunij.pdfIn PDF document text
    • http://tcihk.com/userfiles/20404811376.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c579ec3c5655ad5b01b0657f8e4a9962/83731678695.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/33749371449.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/94f82f3449e35f53cc595ca0c06cdae5/xegodajasejozogaximipujo.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/68714639894.pdfIn PDF document text
    • http://hydrem.ru/images/file/bobejakataxideradifegejet.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/pifipajuxaj.pdfIn PDF document text
    • http://veitali.com/upload/files/34819731140.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5eda595016a92f348a3ba798ebc0e9f9/guwarekapu.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/kogujude.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/93556423285.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/dc636f2493e4a3bc2291a840b7794106/82101482632.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xoruforekunekefulabumibaj.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xigilugozuko.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b403ce7a---dotazufomixukuwokelixe.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_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 10480 bytes
SHA-256: 0c97af7d6d00e939ee8b728f382495934ec2c7fd1c3f2e114ac720a77c41334d
font_02_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 16908 bytes
SHA-256: ce936afff3e205e7fd564ce18136362c69b31a5878d5a5a43c254f17c91a0cac

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