Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2daa08eba31b77…

MALICIOUS

PDF

93.0 KB Created: 2021-07-22 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fc8792d612a49a8aef1fe822270253ac SHA-1: ff0cf930d1babe7d5aabb241ea9d233acc15105c SHA-256: ae2daa08eba31b773ebe9d215bd29471487780c5b7420f75059963ae7d84f89b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://agrilaui.com/userfiles/file/96895765767.pdf In PDF document text
    • http://odpadykj.cz/UserFiles/File/84931421839.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/17624963475.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba716e6e948---febizeni.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/desobeleg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f417056c---81714344077.pdfIn PDF document text
    • http://someteme.com/archivos/_20210628090317.pdfIn PDF document text
    • http://prestopc.it/upload/file/21462449114.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a9227408d---12366625274.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/zujojabumipiso.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/deluluwenazolojobesezod.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/mejetilemuv.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a72083570c6---86059951255.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/11876791969.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/juqgghqdm7poq9mapj0hdtgb74/49072507049.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f64ec86490---jomigadi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdee88f0c7---kenugukuzepanumepavimamo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/e09lo2hjkbug02u1ha73l6in6b/torapenasagawajoguxubivi.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/79373003870.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/016f0e46c624fa4501d4498282a61f78/tizisujazexe.pdfIn PDF document text
    • http://hydrem.ru/images/file/64788422376.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/1445496886.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/mekuzipesatimewu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/05a757760385aefdc58b3e3d9eb2a7a6/nevado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=water+penny+scientific+namePDF 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_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 17624 bytes
SHA-256: 433951c7f38d025451b8458471305c0278d13a6f326dd44ad3143bcb13c0c4a9
font_01_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 10580 bytes
SHA-256: 2f0003ebaa411cc5c17f577437d58857e6c0c435a15180af0ff07b208ac73ab6
font_02_sfnt_off00014d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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