Malicious PDF — malware analysis report

Static analysis result for SHA-256 703ac686bd4cf321…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 00:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fde24aa26f06cafa5c6e317d85f2be98 SHA-1: 902fdb5db2d9b62d1c60b8aae05d0183c3f96209 SHA-256: 703ac686bd4cf321bbce404a017d169f07b89b27afca71c4a06d423d8245b399
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of a link farm pointing to compromised CMS upload directories and other external URIs suggests an attempt to redirect users to malicious or phishing content. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript serving as a secondary stage or lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cgeminfos.ma/upload/file/24393697513.pdf
    • https://dgssu.com/upfolder/e/files/20210906163657.pdf
    • http://artcvajk.friendship-match.com/upload/files/wezorofobedamigusosogeva.pdf
    • http://cjmfgx.morefriendship.com/upload/files/58594647804.pdf
    • http://theseadiaries.com/ckfinder/userfiles/files/fusemajokevo.pdf
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/45503623510.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b219c250---67924049168.pdf
    • http://laibros.com/ckeditor/userfiles/files/61880984814.pdf
    • https://maritime-models.com/userfiles/file/58981075384.pdf
    • https://nacituran.com/userfiles/file/vejeleximubipozawim.pdf
    • https://perfectprojects.ro/userfiles/file/webedirakinepawin.pdf
    • https://bold-iot.com/uploads/files/202109161329534793.pdf
    • http://uchid.com/uploads/file/21271525964.pdf
    • http://pantryscan.com/123cars/imagefck/file/xokite.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6a471de1---nepadalegeviwux.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/waxodajenukix.pdf
    • https://delcinfo.ru/img/files/files/88018093268.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161490167ed0f1---3779492191.pdf
    • http://textstricker.de/benutzerdateien/67790848838.pdf
    • http://classiccar-jp.com/js/upload/files/kudejawuloj.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b04d4ef639cffcff7bee0e8a412db6ac/ridixidenulufo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hiruad2qm9k79arufhl3mhfij1/zazewabegofakobur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=madea+goes+to+jail+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE52 16792 bytes
font_01_sfnt_off0000c664.bin
d5e90bab8be0dec2bc73f2e24a8a258faf5e7a15cd0f20664f29da9f5699105f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 15556 bytes
font_02_sfnt_off0000edc5.bin
863c35d2432f5bed2602570fdd22040f903c80580c5347f2d8e4437ad56a557f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10780 bytes