Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a491893b45e42a5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 23:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1477485826e15798f651a6eaed0f3b36 SHA-1: 7cb88e11b321c39eb0921db5e3a2faa7182b3513 SHA-256: 6a491893b45e42a5a0e1c5b89ca32d42927edd92878638b532168a6645c259aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious sites. The embedded JavaScript stream further supports malicious intent, potentially for exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=network+analyzer+pro+apk+cracked PDF link annotation
    • http://myhomeinparis.com/userfiles/files/11364595460.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xuwifobozubasilaresez.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/12553298893.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/gerutonuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5d61520---gumanitejetopemi.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/81811598183.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/46529338766.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc05e0c6---nidelavun.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/sipudevaxe.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6b13479c6517d89a56607de9b170ed15/52387512990.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613480ef79258---16787103229.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/96042171638.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/4dgl04nn5addnkpos4cjl18q8c/wevunologibafe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/515234b750c97872bae4a61c54897b97/15828484763.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/97494281207.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/lagunipufutafobuvelanafe.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/jamopevivebikivudasix.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb70203ca---waxujoruj.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/38850344321.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/30240554084.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/82951000066.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210912123809.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/dadasorimagibate.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16996 bytes
SHA-256: 3819260c6aaf55bf71d414c95062ce622a622957e43c222d4209d1f4d569b4d8
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10576 bytes
SHA-256: 47c9a0db292fac1ddaa3c4047fa8babfa7af1646f464698090ccebf6a4d2619e
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1