Malicious PDF — malware analysis report

Static analysis result for SHA-256 5517ea99a856060c…

MALICIOUS

PDF

66.7 KB Created: 2021-06-19 23:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 11eab4bae18659f839b639bc325ebba6 SHA-1: 8888e8753018d97fe717a04dc17bdd292faaf3ba SHA-256: 5517ea99a856060c71d59df935b377dd82b975da8c4b6ae75c891ff35ade9a79
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to software and dates, suggesting a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://annjulieskarpmo.com/userfiles/file/kalozoda.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1d774a9719ed82ac68aacbe9d110b90a/zaxuvovivu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fnq8q4kdkk6ojklrjvlhnqs8q2/78308040968.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fa27c818---35041802214.pdfIn PDF document text
    • https://makenie.com/upload/files/18759260382.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/31429145069.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/38994889437.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1229a1adc1b7c5b9a272f359b56f85b4/zelawup.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e036f17164f9f2a9e2c1443ef47494bc/nimewuwegifawuvisuzozul.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/widetabizonoxujisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a75dc3955---nelagowekuluxusilifi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16082149f8f43b---netesebibagajupufobemowu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/89427098341.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/tivibesizimomufubafiw.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/baxevazobubo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vrkmdjuhp6e61qoqjjgkapvha2/ponuruzujurozowidejo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/89928498145.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q9llgglj2d4vbcfjrgrhn16im4/60492307562.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/788c2bd6a03eff561101e6b17b5bc695/mupabekutuwerufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=serial+number+corel+2019PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 5296 bytes
SHA-256: 56fa190d5957b958ee9dc841bef317f08ca724c49829aa3332095974e601a1bb
font_01_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 9996 bytes
SHA-256: a34b6279c6eeeeac642b7e9707fd1e758429d7eaa0e6dbea701ad5364df12dcf
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333