Malicious PDF — malware analysis report

Static analysis result for SHA-256 72171aab87539401…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 09:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0696ce2029f7d41654deb87eeb63b9b2 SHA-1: 88f5dd52d79c61ea50ba73dddd42c7d6b2737ba1 SHA-256: 72171aab87539401f3c5b8a214cbad97161b9c2555162bf87757815de6206eec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links, many pointing to compromised WordPress upload directories, strongly indicates a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://essuances.com/ckfinder/userfiles/files/wojafavovanepexagibu.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072efc756946---36268564338.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/negajidegiwavewowiraniwa.pdfIn PDF document text
    • http://splogservice.ru/content/file/dagozubinesufisujavof.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/bd891c74aa9dba414acee94ea68d2f2b/82575497977.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/lirepubiziguvawumoxawi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1304d341c69db9dbf1a32b6603d77de5/1801425565.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/51101240292.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/zibokifetawadegisawij.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1kj6npgnrlpn6o5oaitkddbcg1/50222986610.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0b1092cdba0cda1872dbd913f2d1cc69/bizukijotokewas.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf9764945---23501592905.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/99016314360.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8426a4ac---minukakuf.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/27322664646.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/jisigajetotojitirel.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/11473795345.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6c6643c9c93a07f325984321b476970c/letudemovegejufugigodena.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/mufolotilodo.pdfIn PDF document text
    • http://12shio5.com/contents//files/zunator.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c110efd26---midazesa.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cd3cf7o4s34aj0vk1ni1leg0k0/54620986658.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/womiwik.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/pakeduvogos.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/pigizaxam.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6bbf2db85---33237292205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vishnu+sahasranama+pdf+gita+pressPDF 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_off0000ba6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6A 10848 bytes
SHA-256: 409a4b6685dcba0047c2c7048f3b71cee85ae9030b24f192a346848dfae83fe1
font_01_sfnt_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16284 bytes
SHA-256: 05ba2b0266f49daa88cd99b6de020144649cec1ee71653269e2e7a97b7a707b0
font_02_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1