Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a97b15171d54113…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 10:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8937ddee1f83c33a2e06f02c4d2f4cda SHA-1: 3ae28f461138b290ea0b30630aff9b58963812b5 SHA-256: 2a97b15171d541131569b45f36e371c37db75b6b995bee14b0fe97c81e73672b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous distinct hosts, many of which are hosted on compromised CMS upload storage or disposable hosting. The embedded URLs are designed to obscure the true destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chrislahoda.ca/userfiles/file/4076705350.pdf In PDF document text
    • https://estoniapools.com/contents//files/demavofuvakulodima.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2e6ab254026b1e5ba763c087c90b0261/gopom.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/hcltqc2ivlnimpho792lfv22g5/vizovagalekatowinusilu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/57808923204.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/75987295213.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/533454bbf2271dae9030c3db6fbcd538/nazijerilikesavawomufa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pcbmlie09h89vlo3hospo29l96/feraxejorekudebalol.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/fb43bf9b7c9c7886651bd0653a6753ea/jomewibujikotadasunufek.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/59668537059.pdfIn PDF document text
    • http://ashioke.com/images/library/File/48475070959.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/13162050874.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c2ccd213---bajevizivolu.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/37182047822.pdfIn PDF document text
    • http://fu-xin.tw/uploads//files/202108081007261065.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/mokivukugamejinomemidivek.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb43eaabd---55475894871.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/47268367779.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/wofonukikixejo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pagezamanesezitonem.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/79454319277.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddd37befd---12286387224.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/58220866803.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/fivapawimenomuposikilot.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vcim1va3u5re7s8fh8i9698sn9/84696963143.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101323555adf---besizikivokomozire.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/24264640810.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090468fb1795---78398308178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=first+conditional+questions+worksheetPDF 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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 10868 bytes
SHA-256: a04a23f6a1da850a9abf522e61221edd13e26e08bd0200ae41b8f24883dc858f
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 18240 bytes
SHA-256: 9135cd6e94d3521e047e5cb9db5c8af48a8da5f62ff3c497fe42b40d2b963c77
font_02_sfnt_off000132b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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