Malicious PDF — malware analysis report

Static analysis result for SHA-256 9098cca575be4227…

MALICIOUS

PDF

94.5 KB Created: 2021-08-12 11:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01108fd01f3432307f043b3134f882e9 SHA-1: 9f0806e1311ffe28b7dc192250ee04667660f263 SHA-256: 9098cca575be422732b9484247eafade293d48ddb430abead3907179d44df39a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=vmware+vsphere+client+windows+server+2012
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e91116cfe3d---90240147571.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fa91d9c5d29cd5abda8642566203c73f/90008719103.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ccaafe16804f5a9b0ee6313686968c5f/kerosawonikadamexe.pdf
    • https://wcfkenzi.com/ckfinder/userfiles/files/wozatenuwudad.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6fb6cda59cffc26622f9851ef01e1490/fabuxufab.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/mldh9166trq38pdnsqm9ulv09u/27889847978.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d856ed4e248---59227129075.pdf
    • http://suachuathietbi.com/upload/files/69735420978.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608036177b966---22698703688.pdf
    • http://df-2.de/images/daten/file/11761679634.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/87055529774.pdf
    • https://samuelben-horin.com/userfiles/file/1324338257.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/bekusufufiwosisozabanij.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6d21c83b645d4d4ee76ad8a6db7a8945/42165078438.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1d4eef81b424b70d016b4788b8bfc3d5/noxalawowerejak.pdf
    • http://langeline.com/ckeditor/upload/files/95801957843.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f02f0909c---29244575814.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pizodasujivig.pdf
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/siwunilovedozawosode.pdf
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/nonavireduvoxinavu.pdf
    • http://cobe-ing.it/userfiles/files/33447552895.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b542b4645---dedevaxubuxudowaj.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c6b6ce5a7c4e01f40dc4e4e2b7db8e4f/63882075088.pdf
    • https://profesa.net/userFilesfile/85380083967.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010afb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes
font_01_sfnt_off0001230d.bin
f3244526246332c07b5b24e02df530f41e389b115ce4d6688cdc19923144e7ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 17504 bytes
font_02_sfnt_off00015125.bin
8ee6d9538c327c93e61938935628d1a99471aea578e6a42fe5719497f594224a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15125 11196 bytes