Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdab90fa813c545…

MALICIOUS

PDF

98.6 KB Created: 2021-07-04 04:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 52fe81d37e671219480627ce67fa73f8 SHA-1: 2e671fa48e67f7863f309cf4c2c198e0c4dd09f7 SHA-256: bbdab90fa813c5459bf469454d26c32f5256cf53bb4584ba28767450c4283de7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to host malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da138b790---pigusidi.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cf4vstot9v9pi3ejbnmhn2u547/ribufu.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b37207d5---nizejifexusidalo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a07d6e4b33e041b4db6fc8f3ddef8780/42683707778.pdfIn PDF document text
    • https://ikima.fr/uploads/file/dizivunikoroxi.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/i1buccdou4sd1eo27mtrkuqltb/padovulukawurirunomatuxe.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2e4c1d8c---miwovajizorevege.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210616210151324.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/59009443718.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d1a2e3ee---dolirepoguvikujegove.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/84366732179.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/nemilutusatimoluxuv.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/efb39a03aadaefd6f75223a90bb67ca3/44974494390.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083261784a44---pavoxez.pdfIn PDF document text
    • http://servmed.net/userfiles/file/sulitilasoj.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/nuzutubujopifamu.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/873075779.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/889a6611a833035be0d9fc385150136b/wexinorodug.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/520075801.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/82338350654.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/at7g60en7pbloc63uajm8vovi5/90831905186.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160856cf43226a---jefazudi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf38d3129---60611005853.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7753e734---bunimumekiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=educational+implications+of+gestalt+theory+of+learning+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_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 11264 bytes
SHA-256: 8666fde1def92d915249f5124eb5fdf8a451c1fd569f0dabbb99d30f95d3da97
font_01_sfnt_off00013908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 16860 bytes
SHA-256: b286b5d95f34223df90262ae41c7cc8f83d5a7294e2c6de001604f5c72bb0c6b
font_02_sfnt_off000164a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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