Malicious PDF — malware analysis report

Static analysis result for SHA-256 028a70ebdc4196a7…

MALICIOUS

PDF

66.3 KB Created: 2021-06-13 15:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6c7051b4aa3464826e12790e36536d84 SHA-1: c544a67ed925febc48a64e0a55826c280f1e4c5f SHA-256: 028a70ebdc4196a7fa691410554ae60f2acfb151d99ba8042ca2c1ab4b539360
164 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to external URLs. The presence of multiple compromised CMS upload links and disposable hosting indicates an attempt to obscure the malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=robert+l+boylestad+electronic+devices+and+circuit+theory+pdf PDF link annotation
    • http://elitvorota.ru/f/file/1699354644.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff2acedcd---xobujexosodijo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e12b56f43---winarina.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54be8bf814---44011671705.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bebb7bc7a---72630784483.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a6388d14cf1b6bddcfb9d17f8702f2b2/kesekavujuloxoxuro.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093e59c6d257---pubapofegunirewu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b8773be7---nekunozazuxelabu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e198d1b5---84483569826.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/18186608757.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jubamosepevovenazolemip.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/dagevadonimosup.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/40726924938.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e376745d5b---23852949864.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bf870d2a80fb526e244fd84566894ab5/32163456609.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 5552 bytes
SHA-256: 2ee7d47466bc78739899e8e044b0eab69ce3914affb55a706271c68f12356a4a
font_01_sfnt_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 10380 bytes
SHA-256: 2133758e1ae043defdf8630ac51de46089697ef2d74223ce8e8a9b5fba8db074