Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ca2cb88e18540f…

MALICIOUS

PDF

116.4 KB Created: 2021-07-25 22:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e36cf7ef4f28fd23a4e257105d19096b SHA-1: 1a349cabe0be195a17323df6af9ee9e4acd7f387 SHA-256: 52ca2cb88e18540fce925fe3d8d44274cd104a7c52b1cf5484d0963182b0cbf4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://apogeeconsultancy.com/upload/files/61013104334.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a7024e48d---79533635188.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/jogaxebatinebel.pdfIn PDF document text
    • http://rideco.hu/upload/file/86080766839.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/bb5048ee6fa21b4e1bc9dee58439c8a2/23086068565.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/45692608186.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/rezixefugefojaro.pdfIn PDF document text
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/71177406706.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/zuvadido.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0af075b707---lidoj.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/sktrlsjudbc5f1ktcg6scn8do0/tirisusakobul.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/e9oams0npjuc8ueaapgsst69l4/bokoguwod.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/83396645640.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106131100337288.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4cfc81f4---25440351970.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/698b525235dba80e43675c1ef6054ee0/larixulonimezuli.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/j2eeh240mhrss9bobea10fk89m/72364228022.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607400f9b57f9---5277599837.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/lje5tsilb4q63gmd54a99tr485/lepaputuvuvovuv.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lelilitagibo.pdfIn PDF document text
    • http://grupophi.es/uploads/files/57029074226.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/54107586788.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d08b73c5215e798d24e22e3b4e850db3/46010169451.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7fad4247---2371491590.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/96261529740.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/daxopamazufetatasevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+apk+royalpoker88PDF 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_off00016146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16146 10528 bytes
SHA-256: dc3612e2c541a91c2b486d05e35beab0ccb07b66468926fdf6135b818feb18e1
font_01_sfnt_off00017969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17969 18384 bytes
SHA-256: 5fd25752171b8beefa7e772a46c3e92da80c015fa51ecc1e74014131c3aa288f
font_02_sfnt_off0001aa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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