Malicious PDF — malware analysis report

Static analysis result for SHA-256 198e4cf2c600d1da…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 13:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a44cc020bfeddff129b5950daa615ccf SHA-1: 142d9c577fbe5d3542eda99c71cdd0bee016849d SHA-256: 198e4cf2c600d1dab0d682e9aecd76e705ff373a7ed48983def3e12f7143753d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest the document's purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sochi-riba.ru/ckfinder/userfiles/files/piwetoririrelamaru.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/movetumikaxetivemimuja.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/68246959043.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/48148485245.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/vunakijunikoxexev.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7e41efb8---66694392719.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/98263541895.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/gozul.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/4592177831.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613429581adde---zaxamanoreregomapur.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/xadalizud.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/dumuxezasusanofo.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/50053186395.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/14118561851.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xerepokawitopofisajo.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/pofukuvezajukizub.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/vijekuruziwano.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161300940c929c---23019918327.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/notimewaduroge.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dofirigogozupidelexi.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/31431506047.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/dovekoje.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/murasezugajugem.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/54084675710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=file+free+fire+maxPDF 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_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 17516 bytes
SHA-256: 5f077b21723efde06824e4ab5a8d406ca08acfb8c40d1dda860bf085c33ddbdb
font_02_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 9964 bytes
SHA-256: dd9930b59b3e71c7f0737f5723b7220a32d7c13445babe4427f54d391653edc1