Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e58c3443e06c69…

MALICIOUS

PDF

106.9 KB Created: 2021-07-14 06:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f86b6ff2c6fa368d7a6f1b423f1b229 SHA-1: 53e24ce88b58b1aa064bfc69896863d0d8336954 SHA-256: 62e58c3443e06c698d53a2dfa57e952c061269945271ae9f057b3ced755c2d38
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d807befb0---vatigukudesofowujatene.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/93947120394.pdf
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fidabexulekenudej.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160826b4a835c7---tuxofelalipedadut.pdf
    • http://bvsaigonbinhduong.vn/uploads/files/71068653215.pdf
    • http://golden-candies.ru/webroot/files/files/xuwiguwaf.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d4cf6999bf0a6ae35861ebf1ee9199e5/8783702451.pdf
    • http://bularz-auto.pl/images/userfiles/file/27282765460.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd92807cd---47067868335.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/09dfc24913e163138c0145015063d547/57148387480.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b41a7208eb4---34380672074.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20d8d4b79---28711095784.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67a64a25b8---vobavifenadakelaguda.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/fkafnd56plhhi1dei0lsm9lsj8/5230529289.pdf
    • http://www.ecvbrass.ch/user/web/file/68820228189.pdf
    • http://foodchemsino.com/d/files/97011970481.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f53b34f8---26768094577.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5lirm7qgnop496fl0m3rg376i0/panoxobapasotevewema.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/93861942427.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d2a9b9bc132f22d1aad800d2d407b893/fubofeleneloxo.pdf
    • http://ambvetfanini.eu/userfiles/files/28399397551.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/brju63ec3b3p9g7ah20gpr19a6/91056401972.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=to+the+races+word+search+pro
    • 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_off000143df.bin
e6e9a63db31a18c9c23901c3eeadc409054c2c7b524742fa1dac0085ed65b7c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 10420 bytes
font_01_sfnt_off00015bb8.bin
f4da461e25b3bfc9685277e77386c5c7cb3e23400a308cf0ca4a25b1b2fb562e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB8 16652 bytes
font_02_sfnt_off00018680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18680 16792 bytes