Malicious PDF — malware analysis report

Static analysis result for SHA-256 198502e6324989d6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 18:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e9d2842735869852715497082564068 SHA-1: 67a229eb3111e7dc79fcb963e0c3a65bc3bcab41 SHA-256: 198502e6324989d692001133608a39835ab8257ad30e5f1bc4b42d996fe701dd
156 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be to lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=hp+elitebook+2540p+manual+pdf PDF link annotation
    • https://iskoruma.com/upload/ckfinder/files/99063216672.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/puxezosot.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe7785f347---vuvidigosufejovipopov.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210705123706907.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/62124493449.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aac0ab9c0d388f24db907d09589200ea/bojeludaxemi.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/zomirolowo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f459e5c66d---pidifufab.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7f658167de601bf9d948e4daaf7d0a27/kumuroborusopexor.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/93093139990.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0163214b62844d87ff4156e02d06bbab/77674288917.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/midepogotiladeperam.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda6d84079---32524665918.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/zuxasotawazedipiz.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1629244670.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/58472355101.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/85970111214.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/712a21a3340c5ec8121f0bded7fc3fc8/zikubanokidowojewejewuv.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3374fb6538---57736815390.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bexukapafafofuluwuwade.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d35ed6f763365d2b7e6aa741e91c38ac/wapadofak.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/misabonukevelolisanu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/48229038936.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cae3a918a---11963773100.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2cejupd2ac435u8slrldjuhpt3/delexewiremomilavapivawe.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_off0000c139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC139 11168 bytes
SHA-256: bdad550bef52fa8309a26b1021f4a046d9920827ecef9f0e45ef0d0127950037
font_01_sfnt_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 18548 bytes
SHA-256: c4d8cee6f627d4305b2560be504317b82eeb48ce5aeaa8621ef23a74ff0b5a12

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