Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de4409200fcf5f5…

MALICIOUS

PDF

100.1 KB Created: 2021-09-09 06:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fc72906a8f1eeb5f04d3e98b32ee0b5 SHA-1: 7334052fc489a3081ea99f649e924e36c4191997 SHA-256: 5de4409200fcf5f570ed0868418e52df41dd9160eccce3e0da02f81107d9f7f7
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing and social engineering attack. The 'SE_CLICKFIX' heuristic indicates it attempts to trick users into executing commands, likely to download and run a second-stage payload. The embedded URLs and link farms point to various disposable hosting sites, suggesting an attempt to distribute malware disguised as a system update. No scripts were extracted, but the PDF structure and heuristics strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://drafthe.ru/uplcv?utm_term=update+win+10+offline PDF link annotation
    • http://lollanaclinic.com/image/upload/File/26425951214.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/84303000820.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jesabivizetixilejaru.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346e133d56b---47521023231.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/fipezola.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/43074211578.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/64074899515.pdfIn PDF document text
    • https://hotelcorona.ro/files/fomofifezawopulopoba.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/zazolenibutometoseveveko.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63701389906.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131424e39bb7---66029826800.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/xidexozip.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/96274614704.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/fanafaw.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631122255.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/dudovajiwevenuze.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/74991854293.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d81280293ca9092cd144b7d152329a1c/kiliw.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/sumikeje.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210909004416.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/36901927547.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/zonuniditi.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/bekelefudet.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 17788 bytes
SHA-256: 507bcb2b36e46542929556c0c3d3fae97a61c155a227812c7623101b7b1c713d
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_02_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 10492 bytes
SHA-256: dc3ba6978f35742bbe10bbb007a6c7f142a5625ea1cd0d4d8b5efe44d46d725c
font_03_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 28688 bytes
SHA-256: adf638180ac9a29c6d517a58ed1552c3a249d8777782285ce5f81e1ab8eee933
font_04_sfnt_off000168af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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