Malicious PDF — malware analysis report

Static analysis result for SHA-256 37365eebdddc58c8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 09:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c5073570cbb93ecd5c0f4dc65fd09c44 SHA-1: 96418c986c001f04f74c107191f3d36398434ec2 SHA-256: 37365eebdddc58c86cd4f09a916159e92e31a8d3f4487ab89a743c2e92e4175e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://coretry.ru/uplcv?utm_term=three+letter+words+that+start+with+i PDF link annotation
    • http://sobateracota.ro/mm/file/wojiwezutojagi.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xibewasexaliteroduvenemu.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kuwaxafojazobofemiwisitu.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/migur.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/nojodakodefige.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/8419603059.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/63726557618.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/90813045947.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/mojigifiwudesatajubas.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332784f2a46---pokewafoker.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/54792701004.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/fdccdae944bfd34f6a49315633285d54/41849851760.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/sisixexobokogowikupaxapok.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/penawivod.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d97338b8812f29e6f4f1c7d2e271a55c/45790809473.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7f138daf---98737962043.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/32221932154.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/91559243260.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/kojanidobegamubomuperig.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/420951dc4ecfae3897d391e58046600f/putazulomufevanalajoko.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/90922847237.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/97322787995.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/63367241242.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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 10292 bytes
SHA-256: 44b30330e7eb84e2b85ecdd0fb019091bd8c5a2cbdea9675f7a8f4b27cf1278b
font_01_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 17976 bytes
SHA-256: a8cbe3fb44dd44d66380b1917fa2520883ee5d4130f23239d2644ec178e488a2
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1