Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e49636a7e94fb18…

MALICIOUS

PDF

83.6 KB Created: 2021-08-19 04:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa848b51a6979647ff01bb0983347929 SHA-1: 80acde9f9127765d7fa1f48f20612236847e7145 SHA-256: 9e49636a7e94fb18a0dea6a6bd655666e5bad6c50a73036d3f44132cd042727c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress sites. This pattern suggests the PDF is used to distribute phishing lures or redirect users to malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=hcf+and+lcm+worksheet+ks3+with+answers PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54ebb2a49---86025778685.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/81539804326.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/75750610517.pdfIn PDF document text
    • https://digireg.cn/upload/xobiwav.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/86844128491.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/80949702802.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160888fbf380aa---67446565433.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/65211147413.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075af92a969e---55833124618.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/n2p01s8i3u81er5htmv262lhc0/woxibagakezinowuxev.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/96414752498.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/44c1239da705f87f4a8725531244abbf/jisiwetoxureveruwa.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/21204733440.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/r1gegfkhto1td77odvu5hp5m20/99627720314.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/wafadarubopopu.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/46152520150.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/47ad5d6cd86d99ee9ebf81f89c10b2a0/3534942329.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a36cf11b107---deganexiro.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nikeruzazusulador.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c63b53a2b1b---84868750702.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56dd973d0---37472153869.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/filitijujesezogelesivisoz.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_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 11084 bytes
SHA-256: a4e015792fcf52f67f806b9f938941eaa124bb902e4c042681100585f8a8d327
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 17232 bytes
SHA-256: 4215219c277ec7714dc5124e4a16e7af99c69cd096f34e12201cd977fc0eb846

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