Malicious PDF — malware analysis report

Static analysis result for SHA-256 6673e1f540d7077c…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 09:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6de692cae5671d31475f618899d0b7ff SHA-1: 10490e68f40a07fa97f1fd775b8deab3626ba43f SHA-256: 6673e1f540d7077c98f4bfb406d14befcd89551859cc0327e24f0341a8be8fef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple links on potentially disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://pui-vital.ro/msg_media/file/72656414900.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ajgcjgb8npgpvgt6gf5pu3k3gl/74312063896.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e3bf89a5f---fujovodunitiboziwime.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9a81b596---xugufugoka.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9adc9005---20557376329.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bbabb34903b33ee83ba3ad699d5f42dd/82667459942.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2c9a67315c7e6d7cae51c2e9765f4c03/31530390327.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ht7kcj5hb0ji7p115iq2no7lt0/mogasinofopipubimifug.pdf
    • https://carcable-bg.com/uploads/pictures/files/fawugumenum.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bdd64b6567e77a1a923d203e43a0d091/vezabirubokejokirama.pdf
    • http://ingmontagna.com/userfiles/files/webozuxudemigibara.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0nsd5n954j70ohvtkasj964b8u/42046787716.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-26/20210526142156376120.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca6b80989---7214225974.pdf
    • https://tecnicadovolante.com/images/file/97993789537.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/952ff9f183d720455c1fe93e38648907/pubepefidosebadaxolu.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/34828900204.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/793e0713e3f0ccd5759ce79b7e626e29/29099408946.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712531cf8eb---21723059662.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be9be1c1605---84930079445.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b09e03f39ad66bf1c9d680663eecc2d9/3368790809.pdf
    • https://mecaniquekd.ca/upload/file/57600099299.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9j2fv0med4hv71m3khf24o8crt/95346388856.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/93887135920.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/lifuwepizemezeruwesutof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dead+or+alive+2
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1c.bin
9934edbe732298db62f3ac959f4e71ef4e0e7800a9778b4f36d26ae947ea47e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10060 bytes
font_01_sfnt_off0001138a.bin
981e55fb0a8ee9411254007d83b6c8328a09287a19684841b47f18d8ee17603a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 2464 bytes
font_02_sfnt_off00011e42.bin
6b65bbfdb4cc791f67bae48c76fee366884763600789ea77abe0c4caff0b0709
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 17068 bytes
font_03_sfnt_off00014aeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEB 16792 bytes