Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aec118dd09a144…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 09:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 77215a775c5c96695dbb79e4064602da SHA-1: 21ee400ec0096d52d0ea2dd7d48510d16dd24011 SHA-256: 87aec118dd09a144f1870181f3b64be8e8c8e8c359fca47f5182832979a24242
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The file's structure and URL patterns are consistent with a campaign aiming to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=world%27s+most+important+renewable+energy+resources PDF link annotation
    • http://clingac.com/d/files/84140505489.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/bovalawesoroxakela.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fb165abfeb0ea3ef87c11226f26c6b01/satojaxipipatemolomixupa.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161416ca68237d---favomo.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jimofa.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/9899970447.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/66722863269.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c53ed516e---56161948408.pdfIn PDF document text
    • http://swhos.com/upload/files/xejizazawuwefad.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/65031843417.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/pupedilejalabopelemefo.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210909070835.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/mewixufozapuxa.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/98893538070.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/22248727991.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210914075240.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/45914203779.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/32998628044.pdfIn PDF document text
    • http://vanhacollection.com/images/files/voniwisilinovakezakire.pdfIn PDF document text
    • http://wamer.org/userfiles/file/77355040003.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ca97258c5f85326791d1067c199e6504/wamoxaparurepezobut.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/kivewowojokoniwowerilodep.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/punesizasato.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/nudejinidoka.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/45999039533.pdfIn PDF document text
    • 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_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 15240 bytes
SHA-256: 295cf7ead424022c766b942b95f4e17b1a9b3c2eeb0f5b3a63af0c19e2af7c73
font_01_sfnt_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 11324 bytes
SHA-256: c3ac1efafd76e8372085de43db22c80bcdaaabe1e00c712b68900dcf72080ad9
font_02_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.