Malicious PDF — malware analysis report

Static analysis result for SHA-256 097f89e1873ad2e4…

MALICIOUS

PDF

89.5 KB Created: 2021-08-14 14:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 708caa27ef0421d74e0057a239499a5a SHA-1: 8c41af1eb2ee870e06688f6fa0a9e77c1403fda9 SHA-256: 097f89e1873ad2e42719c604b53090df140e49420714f0940d52e6d459ea8f1e
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 pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://artkulinaria.pl/sites/default/files/file/jigovifi.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/kedij.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/38733756373.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/91obphun00gje63via7dj5i66c/logijaneporexavotoro.pdf
    • http://phongthuyphatloc.com/luutru/files/gejonudekuk.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16111e80096e7a---57627846487.pdf
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/gulenunigezuved.pdf
    • https://myclubowners.com/userfiles/files/bivaropeguwinitoriluvazor.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3293d02244a549a5e0ba90ddff6e79dc/fevesejefezeb.pdf
    • https://aimhc.com/userfiles/file/14899240723.pdf
    • http://hzjksj.com/images/upload/File/zasetananum.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8rc08uu94tfcuitn3a48bhdns5/70483680828.pdf
    • http://firstcuwire.com/file_media/file_image/file/lipofunubafiwen.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/45ebeda9463018e7c2e31b8c1839d29d/nojazaten.pdf
    • http://hakkabrothers.com/userfiles/file///fokobituk.pdf
    • http://studioghittigargnano.com/userfiles/files/67658192816.pdf
    • http://studioindelicato.com/userfiles/files/22469673529.pdf
    • https://cplastik.cz/data/cms/file/2112889382.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df0c06eae82---sixakofofabemubopomulokud.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/fimogujutularafetumonegoz.pdf
    • https://chornakorn-packing.com/ckfinder/userfiles/files/48448841115.pdf
    • https://plasy.com/uploads/file/kubalaverexeletaxogevij.pdf
    • http://dentalclinicbangalore.com/uploads/87700907405.pdf
    • http://ekvatorbl.com/userfiles/file/76746067580.pdf
    • http://mvdeastudio.it/userfiles/files/97332705466.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+gallery+app+for+android+2020+reddit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f820.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 16792 bytes
font_01_sfnt_off00011037.bin
4bdf6198778e11d7f11253065cdbcadaa7621c85db99fc4a58e38d49a66da9d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 11080 bytes
font_02_sfnt_off00012a0e.bin
64f5a80bd890e1fda39e42ab7ccdc67841aa305367cae67963afa9b9771fb586
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 17248 bytes