Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8b28c11aa1c66f…

MALICIOUS

PDF

90.7 KB Created: 2021-06-29 04:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f311ef5b641a08be8cfa90af4fff4c69 SHA-1: e388ec12e9edc0de24f67f693fc0d1b7061f7cc7 SHA-256: 4c8b28c11aa1c66f1d31ef903e54e41a98fb345e3b349c1263a215c357287adb
204 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains an advance-fee scam lure, encouraging users to click on numerous links, many of which point to compromised CMS upload storage or disposable hosting. While no scripts were directly extracted, the PDF structure and link farm suggest it is designed to lead users to malicious websites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://armagedonspedycja.pl/files/file/wodojebedikuxib.pdf
    • https://kodcomputers.ro/2664/uploads/54357326677.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/05acc12e74dd2a1d3f3170adefe7726f/65547025786.pdf
    • http://santeh.md/img/files/fedimamosegedowisuti.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5c51f589---numizakizoxurenejofonosil.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/56678580333.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/52169209068.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/u1lfcg92glaj1md16b0v1ulge0/buzezavifozapubetix.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3648e4823---81886563974.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b04c48b57dc60c2cd72a265bab4c171f/67342058870.pdf
    • http://www.chatanakonci.cz/userfiles/file/19158965144.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dab2f561667f3d166cc104161889aec6/zanopaw.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/tuwodipedimibuvatetimoz.pdf
    • https://cicadit.ro/UserFiles/file/44302201489.pdf
    • http://retco.ge/ckfinder/userfiles/files/65381064112.pdf
    • http://nickels.design/ckfinder/userfiles/files/kedinazibugibenunovivuv.pdf
    • http://world-spa-resorts.com/dok/8760818252.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e66adc29---87202339010.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/vrjap93ubv1clq2ie388n6g8uk/dozawizon.pdf
    • http://dgjst.com/upfile/file/82794207073.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/22092407914.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9bfd8373d---towutuvirazoti.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/xukazoxuto.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ebde760d32135bd31b9c949f359df0bf/zavojedulubozul.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8e67032d19cb6016ec56405e05195105/luzopisa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+is+chicken+good+in+the+fridge+after+thawing
    • 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_off0000fd71.bin
2835336cd7aff2b8afdc46c119b4cc94e78553bc9bd124dae39ba216d3335674
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10924 bytes
font_01_sfnt_off00011687.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 16792 bytes
font_02_sfnt_off00012e99.bin
b99f4ac97d52c2297f7c244f2dba2c9e31652808caa320e60d3c76659f8cc9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 17808 bytes