Malicious PDF — malware analysis report

Static analysis result for SHA-256 87173723a776b50d…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 18:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7dde3b2445e9c8b1e4d933834c34c18d SHA-1: 54689308f5ce8840ded52415d4cf7f51550c2a58 SHA-256: 87173723a776b50d1249b5288106edf4cc194f7620c2cbe43a9a163fe93bc808
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to external PDFs hosted on various domains, suggesting it functions as a link farm or a downloader for further malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading or accessing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/c0ciu6491c6l11hqdnv3mtlar1/23377651300.pdf In PDF document text
    • http://abw10thstreetne.com/uploads/files/55798185922.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd7fe5def---nimesoniwiluvexumakuxopa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a6fu68etqube81nb1sngfultm1/74117433673.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/wegejogufonoviwotuxaruwo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be10fbb36a0---lezasefipinebeloju.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/21388234633c5e962bda1354ba5931b7/povogimaxifelulopivimem.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe024458ea3---74522204378.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7ade7fed---silibuwerodikigobamozarow.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070fe63045---zawevutoweta.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/acfg43ap8bdvbo0223u1rb5cn1/72639713489.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/13814267151.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/noposaliwuv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a549d47330f---60627570140.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11cabc1ca---rokobovinexufeluzisapo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d7b3c67d3018c463c14e146ed69be63f/15185446154.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/dumovataxu.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/57089038058.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/lugebuvisexoxadetuzipig.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/kevifimibep.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160843d938ea28---16395674356.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/wojopisizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+auto+reply+text+messages+iphonePDF 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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 11092 bytes
SHA-256: 1d8b66c5116b585c1f8bc1f9860b5d1509a4563a8b62773b87a9e8e5e7bcaa20
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 16636 bytes
SHA-256: fdc5ad4030f228aeebe139435b043bb56d2ad81ff3ec09cc656647e1b7454c14
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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