Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abea4b78821784c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 15:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac4485062d86cf0fc43d37ee668d96f0 SHA-1: da1b0e9f7d2856597c8e1fbb0f4660777aaf6131 SHA-256: 5abea4b78821784c5add2b2487b5fb35ab2adc110acf95f0e376928498e6f985
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These links appear to form a link farm, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609266660bb98---29577840007.pdf
    • http://air-con.ru/upload/files/xenubojivujuwojasepij.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ae35895d---runuf.pdf
    • http://maroba-zirndorf.de/file/dizugonobod.pdf
    • https://living-stone.lu/userfiles/files/90315359453.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/346atr86ca6igqohqh07fbedk5/24738296410.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6cd8a72b---pewomedikage.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4u4v91s4jso80d5kqg4v8n3op4/wemuwefujutoxitasuzojogud.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6013e3cff29356382e7242a6ce5eadd5/mikopuf.pdf
    • http://hytechplus.com/userfiles/file/tugub.pdf
    • http://fitviewer.biz/files/file/6418791596.pdf
    • http://abwrichmond.com/uploads/files/90057516044.pdf
    • http://volkshilfe-ktn.at/images/content/files/mujedutipal.pdf
    • http://baigeleather.com/userfiles/file/3896684121.pdf
    • http://fine-cottage.ru/userfiles/file/gedazijijokisekaz.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/r9andu27gk0htcmv676bc8dpcm/logepukidaper.pdf
    • https://abofahed.com/userfiles/file/91404299262.pdf
    • https://dpengineers.info/admin/userfiles/file/84795065706.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/41f46a43d4a066f58203ac59c8750ee5/61340568301.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/63259779578.pdf
    • http://rapabzenec.cz/obrazky/files/32749077014.pdf
    • https://dodomacnosti.net/data/file/wefot.pdf
    • http://www.aluvascientific.com/UserFiles/file/50139197489.pdf
    • http://pokwuttibut.com/file_media/file_image/file/5138874146.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+neutrons
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59d.bin
87213134f2fe2b04f33f9775e89d68e1e4ecad2ed4f8dc2fa743c26f16f5bac5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 10316 bytes
font_01_sfnt_off0000fd03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16792 bytes
font_02_sfnt_off00011515.bin
44ac643322e735de2652990b91c03f7f9f7bfd9910ca45fe235b9d0ad854e27f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 18412 bytes