Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd901421db3ad17…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 21:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57c4856293053fcaa33a96440901c8e8 SHA-1: a52f6e5b7a93987846fec61d43e4b0c4431979b4 SHA-256: cdd901421db3ad17ea034ba418846fdfd7ad0f5ddb75ded419b06ca197b87063
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to the download and execution of further malicious payloads, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://smidgel.ru/uplcv?utm_term=percentage+exercise+for+class+6 PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2705a6832---78946333771.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4ceb22ee90f8a7bc4933f559d85e6256/9029019690.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/wigoladijimenogade.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321971ddfd---24781347752.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/7da34t52s5re492vn17dek83a4/zomij.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/koger.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210510165439.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/teniziginuviga.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/sidolumirinabilu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b71cb1eb7---98173270994.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/8374072429.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a2c885a7---bagemijimumuwusevujawom.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3b46e2396191f54752897a4c43121a93/garik.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/70523690432.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fbbbe1615f82f62d8572a507d03994f0/lemilamilu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/duzakefudes.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r9o02m54u39q0vf1itvgu702pp/panimovijiwuwobuze.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacffb13a99---gofuz.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/busoxoru.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/tejawekejul.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t59b0mlackpe8g46f4sk9gm7t0/zegapudomejejalo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978d667b8f2---26924534702.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075343c687f1---bobadurevurelu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wenojobitaxarubuvelo.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/josejapikukemibi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c498b3bd---93404983230.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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 18132 bytes
SHA-256: 2d96cfb3cfed0fa6679f65fa2a1443b74da1c90cf5a6d247a69e488fb3e026dc
font_01_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 10780 bytes
SHA-256: 6b99d892f9c6f59887a69610b332bfb06ba088f747c12fb077d25143d97952e3

Open this report in the interactive analyzer, or submit your own file for analysis.