Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d01e0618f8b3f7…

MALICIOUS

PDF

88.9 KB Created: 2021-07-13 20:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddd142f05cabca54e3cfc88c565ae70b SHA-1: 210095920a29d60e4d8d119713d7cd07741f2cb2 SHA-256: c5d01e0618f8b3f7ee32729463f5a61ce68161ec6e12445bb9400da34dc5a742
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload directories. These links likely serve as lures to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da4f74ed4---bazotujedugu.pdf In PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/17375413613.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ee416d0b3---40680483130.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d733c4c4215---19566397398.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/51815742387.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/efe6e43683060537b6341da5efa393e4/96700189974.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc77f39be9---semoki.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46150b2554---furutitikojozuladodaxe.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/23380324906.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c8b5cbde415d7ad4153b6149f601cec0/85033253227.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/mudiro.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/viraze.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/mabaxarumozovakupapaw.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/utvbdade221t5scbjt59rsvcr3/88167835117.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5a4e140e93f91e7806f127bd0d9c219d/32949792393.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/37850928092.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ii09iceh4ribajv59r8grggmau/98823929564.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9b749847c94a1f32446bd9b9be0d10d0/49694369685.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/9896185994.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c369314e9fc---zikegum.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/35057265349.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/71057954469.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/88912053299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+womanizer+in+englishPDF 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_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10700 bytes
SHA-256: fd1edd5d7da586bd59eebd2792c29def1de01633c863087a60539833fee4e428
font_01_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 17048 bytes
SHA-256: be7df90cf2a2e5e6a1ba214dd39f730ab10988fd9c7da2fd96b26571740c6ef3
font_02_sfnt_off00013e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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