Malicious PDF — malware analysis report

Static analysis result for SHA-256 993e2d754e9d85dc…

MALICIOUS

PDF

88.3 KB Created: 2021-07-14 06:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3096a25db6fe68d42c7908a3cbf402f SHA-1: c035ffd993ad56c5ceefd9a416b34340d6f3b364 SHA-256: 993e2d754e9d85dcf868c8cb1dd7f483d5d282830d6bbc7f473c49534ed59cfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=frappe+near+me PDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b65eed744f2a58afa7feff952d8262b4/33168409409.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/69933090729.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d3d02db9---1336278370.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/580827076a156c3cefbb967c481ef493/50806135426.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/82577017499.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/82b9d3f1e2b534ce187025924f75aaf3/xonigovo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607546eb36777---67804606964.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hdvodlls0ndfsm172akohdubsr/95589271700.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/fimojil.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/afe6738ceb47f77b506aa184d255e30d/37313533973.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2b1de7e1---jifilanaga.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a9b4fe6980bb02ceed3d024202b3f79b/22018748731.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/67288150412.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/napozipatolewusem.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/96244106234.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/fawujupepemakis.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/99fb46abf231739dc2a9995126328ba4/jumanenojirolidadi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c69ace369---61984643011.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71006681b2---jixivifadudutipuvi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/99282452971.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43e82bd879952525259c45d210b596a1/ketoxaf.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb3e8ea50---risefodejizali.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e70f55fc5---pesadavor.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_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 9864 bytes
SHA-256: 0bf084d842b4d1023ae7d98dfb88a4b2177c43ee12b837d351c565a2da32ab11
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 18944 bytes
SHA-256: 0aece9957b798c1caf1f2dfc8a8f6289ad7f7b47638c0db72d76b9f261b60485
font_02_sfnt_off00013ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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