Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aec5660a4c2aa03…

MALICIOUS

PDF

91.0 KB Created: 2021-07-17 18:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 138d36bbb3a6f6ab8a6602ee41a81353 SHA-1: 16b2970f9c7ffc7a4f46f91f1730d0cf4ff5f752 SHA-256: 6aec5660a4c2aa03e3b55b9f91be1817f922ef05ce8a81557997018f0982dea8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites, facilitating phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://chinazzjx.com/d/files/1975264366.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780e74e561c---68916675051.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210603083802.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/49144646989.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3cb99080ce689b4a3a85b56d60691e17/wotanat.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wijinorogetutofej.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/sewafigamopu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e7171593f78efd2d94abf1846541aeda/67448427188.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/kixodirawibobodiror.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/sebupeguloxuwejoj.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7b6bh3l6khpue64gnqntk1v0n4/1014556979.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b831a576---vokezolupikaselaxugagefu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gn9bl4ddb7cdv8shuc1v4bo6g4/44777602482.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/nujibapudutezaja.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/48780993485.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q5ciemqnc9eqokmr011fh2mof2/12682092708.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/popateraxovap.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d61d369d9---24347365236.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/sr7u6suk5dnulqc0hd0vcfjgah/givejuxotal.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/fn14bm269hs99c4dr247e8uopr/83309340866.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ff2f2c04207568326d57de4788e1dfc8/45006967001.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210705101711.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/linomobigalitovuvupoz.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/54193e649c9f2ebd57586e575b78c70d/buneni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=normal+urine+specific+gravityPDF 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_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 11080 bytes
SHA-256: c0efe28ac2e1c3b68c38da1f7464d33ed820c4cbefeef653faa34682b043322f
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 19196 bytes
SHA-256: babc4f6494ef589f5a804abfbe07cda18b8ad59caacf531639b930d2bd238c74
font_02_sfnt_off000146a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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