Malicious PDF — malware analysis report

Static analysis result for SHA-256 19634a0aa73ec43f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 01:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01826568d8f17072074e61922a3a5280 SHA-1: cfd3fd234e7eee77077f36b0edf8a82116b45d56 SHA-256: 19634a0aa73ec43f0c8c3698f1b197eaf4d0c461264fdfe2e96b9b855b13f032
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to obscure the final malicious destination and evade detection, a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://aarogyamedico.com/userfiles/file/lemilopolazononokenewaf.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b7374f53---98323993810.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf0d3a286---zagow.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/53721070644.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094089dcb11a---zilogeperasato.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jifuge.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d3dfb00fa---92967659474.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/61263731671.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a39dda5d2---zisugolob.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/090dda1032671e5f6897e4be09a7501b/75225086774.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/rusenixugi.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/zonezol.pdfIn PDF document text
    • http://sushibelovo.ru/files/kitopanagitavunikikebevo.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zenefonuzizujawepar.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/xegafezalixevokutetogis.pdfIn PDF document text
    • https://timminsrenovations.ca/file/YZdGS6ZKlbSikIMb.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/88051810334.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd70e6dddb---vazufowedoputaji.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/31006701139.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/63338855736.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/13fd808d74e21dd20a3966ad51f53e6d/59572818707.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/84643140560.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e112ef0b250---vowagimakinikisup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=eclampsia+rcog+pdfPDF link annotation
    • 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_off0000c185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 10612 bytes
SHA-256: a63d1f377138c05d52f09c6dbea4122674b9ec1f115ee968475a876029a66164
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 17976 bytes
SHA-256: 40e9120c063ba17e16285c22e8e6e0f66e97e45d79a02d1f35f0a0539135ba9e