Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8cd7cb37748828…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 06:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 976f501f305e94a252b9b077d1665d5d SHA-1: f0535ebc703d7a014526082fbea61f8486988fa8 SHA-256: 2d8cd7cb3774882841f235c9f4c7af6f55adadbabf877c059febb95a1f459d51
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://manpukulivermore.com/uploads/files/4269237789.pdf In PDF document text
    • http://szyoujin.com/UploadFile/file/20210902121758635.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/66044576698.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/33459429465.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/58888289565.pdfPDF link annotation
    • https://aiwcecckolkata.org/FCKeditor/file/kisirulajivate.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613852ad32d31---tufosofanivalodir.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/juvewoloxanozevo.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/7123224364.pdfIn PDF document text
    • https://razredna-nastava.net/files/xefigoxotiwelojufubenis.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/kefakuloguwosukitam.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/ximupexefig.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/98635759762.pdfIn PDF document text
    • http://esen.life/userfiles/file/wirozusaxokekez.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nozonewawitomogirina.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3dda194420b415993e42561a3c4b7834/giziwegujutewaru.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/wamunelozego.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/60611825377.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1811638a3---14339780928.pdfIn PDF document text
    • http://ridendo.cz/files/file/newokowoked.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109060819181103.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/xagapigexubodotoxagexiw.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/xigejarakaxofaligo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133492fbe472---56614608900.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/sofuwuwebisinefupirarus.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dagidimewun.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/gutemezitewum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+check+the+os+version+on+androidPDF 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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 10656 bytes
SHA-256: 2fe143a7677361bb1da6be448ccaec9cdba8460a55177c96f0c00652e6dc7fdd
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 19140 bytes
SHA-256: 6b185cc0b6a8eecc80a35bb25c24a3eb2db742f25f3fc4dc6619e343520724a1
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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