Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5aeeecd1fc210f6…

MALICIOUS

PDF

99.2 KB Created: 2021-08-15 08:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e9b3f94fce1c32bc74580c83c42b726d SHA-1: a5a4dbe1fa8ea15bd2b75ecf64789c4f82019b4e SHA-256: f5aeeecd1fc210f626880643b8570d2de2ecb32f62b8e02156beec0cb122ab5f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ih-consultant.com/ckfinder/userfiles/files/51806165311.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54fcc0b47---54344217713.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a95a17c26---30525156599.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/rufes.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44e2cf0dd---2435208686.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/1a47023baf5e43166b67537848626a11/90030303632.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65214ddb16---20473056133.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/gutugafamepizokudatutumi.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/wajezalunavuja.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b19ef997bf0cc2bb1ea8428bd7e4fb47/68971065369.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/92019736725.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d883b60---zipudekilomirewomadopob.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/96167029518.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/urp8kol9fgf66ullcjufeau2ag/40218896194.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/51700904849.pdfIn PDF document text
    • http://moneymaker-gold.de/files/vopuvew.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/teduvexemusip.pdfIn PDF document text
    • https://kawanmto.org/contents//files/pivowuvujal.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ii0s88m1mdk0g5b7lohrattg7e/vaxumonin.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bd7a8f0988---41640142002.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/zozulosex.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/1715208181.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2ssk041ksit16uqku1p6bsdfr1/mopodaninutuberakav.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/88328614474.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/13b0d681da6629f5a0c9893a577d4136/kajonogu.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/cb256fb9ed43bf50d778c291bd80449f/gaxeniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=glencoe%2Fmcgraw-hill+geometry+answer+key+chapter+4PDF 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_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 11296 bytes
SHA-256: fc6d11a2c7f0179aa3c4cee2c29a641e6f4debce20ef9ee45990727c6583affa
font_02_sfnt_off000147d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D3 20872 bytes
SHA-256: 03cf70f2f43b2863362bed1fe7c8a8a987fc523c6c7e6ae75cc766748f211792