Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71d9e0d000830b2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 18:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 081dadafe38839d4281271eec82474a3 SHA-1: 1e34950ffc9bff25c110ca4a731867955b261804 SHA-256: e71d9e0d000830b2667501bfec6c7b9d1d52b989c2a09cb8a2ee58344470c94d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. The document body is unreadable, but the overall structure and URL patterns point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=songs+of+jerusalem+and+myself PDF link annotation
    • http://blossomtour.net/FileData/ckfinder/files/20210714_11ECCB39B81C72C7.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/bonotawuluvumu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075623567a03---77645884461.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/49746618794.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbad5010d9---15905024606.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/sodagova.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vanerovedozosawunuwer.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/notekegatumelejizutojogen.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fqoe96cg2vrghog8cfforre5m4/55825972890.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wizigu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5ad960851518e6314794effba9db7119/kowojudixilevude.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297f21db74---50305324694.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa820630199---todat.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ace247497---zagevad.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/ruzoxipedok.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/60169499399.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/56458912841.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/88020538652.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509ae180f6---nemogetofivumelufi.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/tijujojoxudemojesabemovu.pdfIn PDF document text
    • http://www.centralperdana.com/file/28402645561.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e5085ac328b3e1ffbaece612c700f1f8/pudumusogiwewezupipodezev.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/32064950950.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/zeziwuwurarupegalob.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607212d50669e---lipokedemimiweme.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/tugejowakoseboxevobigeluv.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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 10924 bytes
SHA-256: 5aa696cd28780b82764f7c06577251e799bf5e07917ed0e376c84fae38331e4e
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 16112 bytes
SHA-256: cdd23a7848f32bd6af6f9c0efc2466ef0e6f8575a653d11933ee51e4fbfcfeb9
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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