Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33794b2dafbaeb0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 00:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d0bd481c34cb316d46c6f078ce1ed09 SHA-1: dd79802d6858b08e6d7761c23d80329aed912490 SHA-256: f33794b2dafbaeb0571ee0e22e280a96e82a67fdc88266a7f7bfadbe17ebca09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a phishing attack, likely attempting to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=wall+footing+design+pdf PDF link annotation
    • http://blissworldbeauty.com/newerac2c/userfiles/file/kilirowe.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/xuwejuf.pdfIn PDF document text
    • https://hssanesteban.cl/files/gamumanululup.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/7085998349.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/81628635819.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078d17f56864---97866621500.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607410a71895f---fonogefofakoxufukivizodo.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/10005847551.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/gijunilonuvizavovi.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/50282550882.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/46530529129.pdfIn PDF document text
    • https://unaizahic.com/Files/files/pagofoxopuvekumuwen.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/79ec38077d48f740d6650a698c1ad684/zesapenipodagufidosegugo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///tivedadizem.pdfIn PDF document text
    • http://mebco.ru/images/file/51314154150.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9704325e80---doxomilefofesopore.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f5c07299e---26209875374.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/favukolomobotojoxosibame.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161237e629b131---pavaxenusupapodebererewe.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/zokow.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160988382b3e39---rofafuduzuneminoveki.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/f4eb64deaf50f22bcc2a289b9e379d84/67750349418.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608556a689b4c---tusumelidixokafunabu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/01bd8cace3bdf100cbead33f6ae025f5/megilitelamokasajexizodi.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/pixuratezasumezifexoju.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 10564 bytes
SHA-256: b36352ec8174edfecabfc95448ac8fd40b614c5da97cce1a58b00c339972b6bd
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 17560 bytes
SHA-256: fd766354084dbd46cb138ee8db12cf35aa1cdeee439f5440253622d326c98fb3

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