Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be50ad9ecf54a4e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 03:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb00df6df2a9a9dc91e5ae26b57f2087 SHA-1: c5b08d438a30dfe282f0dbf5fa219da7c02c6810 SHA-256: 0be50ad9ecf54a4eff494d324219cd0bcbe63ab5a97b2eec8092d52d87591660
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely serves as a delivery mechanism for further malicious activity, such as directing users to phishing pages or initiating malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=purl+yarn+over+twisted PDF link annotation
    • http://jr.ac.th/ckfinder/userfiles/files/49627414645.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9s4gdbl8e5kl53329bd9geloc5/noruvufanopofogomeriritul.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0d00aa75---58931799065.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/25616360226.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/19607202094.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e5d2a6cdc463c6aa5a8c77a7565a121d/21620390030.pdfIn PDF document text
    • https://yellowstonewildlife.com/36933247298.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/getewupisuferezesirimir.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a2eb52aa98a5a7b6fe35235418c0f7e5/xorogosiviwogexulase.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccbb3a867---mabedodofe.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cdbecaba4a14413c5e7928c1304e10bf/nogoxibomido.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/sosaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161099fba0c010---50099305129.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/dosavif.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/6902182685.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/lokawufirijuxikini.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac3679724---piriganuloselugoju.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/deb08e924215c3dc645b79f0ee29db3f/didiwozimupapuwono.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/68662015498.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4514ad5580---80060120345.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/naninanapulasewurojesi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2f7e4ef1a95b84dda6ee23fee6d2f7f1/50796387192.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a34802b0fef79875745d7611ef1fbf14/12434844630.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_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 10608 bytes
SHA-256: 0124c1b6468f82b888c620a9dbf638f5f21e01a735fd27fdd2b385e7a204c42e
font_01_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 17744 bytes
SHA-256: d2dfc633c204a2ce3a1f7dac8454d334389762e7aee8490847c303dbcdffc996

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