Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ffea9b630ddada…

MALICIOUS

PDF

82.2 KB Created: 2021-07-20 18:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2a49f5a6e4b6b2b8daaf31326f18fe59 SHA-1: bc3732c5d8383b982eb26ff7273b8cc414ce4477 SHA-256: 48ffea9b630ddada3008466904b53d551543f3a765aef0af41f2f85904126cb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are flagged as link farms on disposable hosting or point to compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://saothienemb.com/uploads/images/files/85071232041.pdf In PDF document text
    • http://interiorconsignments.com/media/file/butidarok.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b64eca196b---lojozexopalotuvazudawet.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/94221597759.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/1723246551.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078873d94246---golawibujafemilirifif.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/50667568942.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/damike.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zozadawerovuloduvevokire.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1683d2978556a808f225a1c77a060aee/fujuxivokam.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/35745471378.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/fgposr36k166e1mq0aufb4olg2/46791619837.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c17efe04---lexusuwewez.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/binabawenusika.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33621d8f5---56830418887.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609743f6c89e3---vomoru.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/rawiv.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/tolufeguli.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aab194b24148b62c2c01d6cb0989d5dd/86609596951.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/99596263263.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///wesazuwerol.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d429c687d---33117806233.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/99924166527.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/51289903181.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/loboninenapugon.pdfIn PDF document text
    • http://webursitet.org/Files/file/23806957269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chemical+reactions+crossword+answersPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16752 bytes
SHA-256: 0d8668a29900cafe2a7328651b7606a87f6d2427afcdcbac65e3e26b0683dde3
font_01_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 10752 bytes
SHA-256: e74faa5dcb9bacb69ebd3f21387dc0ccc6a9541b4c0a4176d1c2b70127008f6d