Malicious PDF — malware analysis report

Static analysis result for SHA-256 203e0fb3af30c24d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 05:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7da526a18de899ff9ed3d96d22aaacbe SHA-1: 639a8f563cd0227cb3e5591ce302ad070c5d9729 SHA-256: 203e0fb3af30c24de9690ecfa5c1a0c40591238908e8b66b48de581934caf9b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, with many embedded URLs directing to external sites, some hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://idd.no/ckfinder/userfiles/files/masusipojijawexise.pdf In PDF document text
    • https://floresdeserrezuela.com/aym_image/files/25828465596.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160814caed2942---domizewu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8344aaec---98961276178.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/27140673018.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161203a73a8db1---megasonukizixifev.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac5fd3455---vinanivubebudarig.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/xosakefop.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/23649967113.pdfIn PDF document text
    • http://asvpp.fr/pdf/nofobubetuvitumixegeralo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/77e0f009c43ed4fa6a0ab67a797b5640/zidovovo.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/wonezunoxej.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/56532637074.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/98587848476.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9efac59322ce145737cc649ebbb866ce/zigezugukonavidaja.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/98085308747.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6a90eebcbb5f4c4d881171aa9ec64967/76323769637.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/51330838557.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7508d8dd19f3dd1f11710dc699d6953/88667490959.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xaxasisagenojadaxe.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5be1ac3f8077dd6060383f43756b33b0/wefowetu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a02a5ec5303d3a5665d482ec731ff3c5/77592105805.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fb3282a9---79149895207.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611169a268b01---kagaradi.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/12230735512.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/74061463838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=derecho+romano+sabino+ventura+silva+pdfPDF 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_off0000c1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A7 11192 bytes
SHA-256: 4eeb6aec6d2d180a166e07fd58fe4b78f1a3f07e3bfb179a3c6461b2ec7b0a9f
font_01_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 15872 bytes
SHA-256: 765f4014ec5c064f7552e39661121e7e764cb6dd5121e18787aafc84eba342ed

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