Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55e8a9276ab4d6e…

MALICIOUS

PDF

87.0 KB Created: 2021-08-04 15:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab9a19c20408e3f7b37352e039d8805b SHA-1: ffb9eb014cf1ee18a774ac062be41c8e64559ee3 SHA-256: e55e8a9276ab4d6e146065399b021a4ab76ad904be48fcd07e71f3fbc44216ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL findings point to a malicious document, possibly delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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://laborke.ru/uplcv?utm_term=slugterra+slug+it+out+2+all+promo+codes PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dm89ubdqhb5hjlqoovkqevdluq/gugazesiniwoxovujus.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b703427bc18---figik.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c78820b209a---zegajavir.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7830d4db8---4431438887.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1a490b57f09ca3ab2275f7e4be9de081/11393934113.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/96706784073.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/158433a952a291529113212d4f205d7d/5150100833.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/8116681518.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac399b069---fobexopobilufapuzuvekasam.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jezud.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/62661327173.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xujakibiwiberigijerumijog.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/mifezijuduwab.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160acce8e49094---33563880486.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64600415d4---38998616489.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072057f4ea7b---18909831999.pdfIn PDF document text
    • https://ka-base.no/images_content/file/46336761886.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d5605d3b---74143255645.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/tufezivifeviz.pdfIn PDF document text
    • http://falerisztika.hu/tmp/tesewumugofuxuz.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb25b0805e---80131821275.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7735fbd3---96445283754.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e013c46eb---57686184150.pdfIn PDF document text
    • http://naviway.su/upload/files/mudezemalima.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_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 18060 bytes
SHA-256: aa828dc0fceaf2ac708195486e5cd875a19e7254d57cb0330a8a094aa9b3ae89
font_01_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001339b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 11048 bytes
SHA-256: f6f140da8b0f1fb50db7b5493faec71da7187aa13665e94a60410b8209ded304