Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b26d7f4bc21997d…

MALICIOUS

PDF

116.4 KB Created: 2021-07-02 13:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e1e109568b1fd0446429ae78b78a112 SHA-1: 409a9bd9096149a8d91d5de189ef24e3f599ae5f SHA-256: 0b26d7f4bc21997d8fa7f2a24084c946e586361fb4cfa3a2a7d2223a91f3ac5f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users who click these links. No scripts were extracted, but the structure and URL analysis point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9fc562ef394b56258d0a8509690b3275/12749168498.pdf In PDF document text
    • http://capmar.eu/userfiles/file/89182384841.pdfIn PDF document text
    • http://e-hane.com/files/18952494254.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/20/file/20210520_224746_200.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f919210ae---66328594574.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda39d1790---69884174894.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7ce43e699a3df115aee9157383340c43/81168876941.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2958adcd---sefuwazukadudaribenivuz.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5490bd626a---15362900606.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c73065b8592---71576631913.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/nbsrdlv0d0kn1k829n40dkses2/55775049953.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/soverutafigidefan.pdfIn PDF document text
    • http://fabtur.ru/upload/files/35913307400.pdfIn PDF document text
    • http://stattus.com/assets/file/83767019755.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/80876544429.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jh67bq295q9u7bbnv9c5ejcjl7/85794136413.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/dizotal.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/nilomaninafiga.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/33721336951.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f946f20ac0---niromuxaxefidogiwudowu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e1c54f8997e09d59ae9c46fefd9940fc/5894234157.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1f5be73d8d3f17adff61ec2992b83d70/bemajawadas.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d70e3b8eb---28636817324.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/sikeperepuzipasasipumok.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/xokepozuludoxabifimogoloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=oxford+new+science+in+everyday+life+class+5+pdfPDF link annotation
    • 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_off0001623a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1623A 18076 bytes
SHA-256: d30ed5aac6dd2ee79474ac109bcf7fc7c4487a3549c15e88bbe394bcee931637
font_01_sfnt_off000191cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191CF 11044 bytes
SHA-256: d53e010705ee876e2ad4dd78f421a7f8fac963479b88b5fe32417fb82574f876
font_02_sfnt_off0001abc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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