Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed291622d856a60…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 10:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15cd9d2405a21c52308faec4a50d4e38 SHA-1: 4c81729f4d61b83920d6af215d2bbc43f0a9ff09 SHA-256: 3ed291622d856a606dbd077ece956519dc389d88f8f040f048aa134f849e586d
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, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be redirecting users to external, untrusted content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083449d4569a---24317097204.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/lonejirema.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fe4bb7ae---tupubaxa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc91753015---62492212961.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6801f5ffed8b8d3218deb6dfcc16aafb/43364086735.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cff4b70abf5---63923637049.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106280731.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zoginusogixof.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/wotekufafufufetewu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/09fe7a589cc8e3532b14ed5f9bc557e5/bedegoro.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0bcc0d88727d28b1fe61bb6700259bda/tiwaxabanipuvadaw.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/56092223339.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kojejetarimulijewivaxug.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607846ee9f1e3---vavijimuxazovarot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0c8f129f---32975669432.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/22226014100.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/lomod.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/xapajatidonopewanilidafu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2f7679631ad52389708257a79ae87c60/1646251481.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c884auvgakpf5vk9etbam4lld9/wozeri.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ff0316a1a0701a3cdfd8e0548ed29d2d/bikokutudozamifexuzoruli.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/73416727292.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5s09du5d4kjglps7efh84e5uh9/rijosid.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1cd85dcd7992ada771ed320e2107d03/kekatunoridagezunexed.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab900516d58---87302286712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aktu+question+paper+with+solutionPDF 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_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 10756 bytes
SHA-256: cbd04abcd78ef16e85509f67855e7f720dc90229626930204c521441d742ff64
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 17728 bytes
SHA-256: ff0d594471b4f97bda3ee9d01e03212dc5a52f1e7867de7ff810e35b6b6783ba
font_02_sfnt_off00012a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1