Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b7d5e185be39ce…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 10:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82310db7c41b31607decae9ea05873e1 SHA-1: 9edf8bf2aed2e122a13433a8e77629e951ca6d7a SHA-256: c0b7d5e185be39ce865301ce7d5f1fd2ebcf5a48418b6d6819268bff0e10de6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/22726938295.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7a04e91bc7705ae94bafc9375eff311f/xapozif.pdfIn PDF document text
    • http://skolky.info/foto/images/file/82850186557.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612be009ef770---29505733065.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d191940fb4---bokulafusilepezuziw.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rowigorebeledipej.pdfIn PDF document text
    • http://adice-area.com/pictures/files/fotom.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/virozekipos.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/75090498268.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/miweredesapixasifad.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebaa14c7c0---mexezeboweb.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/97652434887.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9eec9e838---51465127612.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210829073258_9eil5c.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/10418188794.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/4275432030.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/kizetivumebenaxovevo.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f6511112ceefd8a51b9e02fe933deb01/84673321386.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/70592194293.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/96395709613.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kujidiravoropi.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210622_231216.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/15283969949.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/aa83dfd0905b26c63b7b68cdb59b3e95/62082919327.pdfIn PDF document text
    • http://bamila.vn/luutru/files/65941747808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=system+unit+components+and+functions+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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 17156 bytes
SHA-256: 7063afb75eef6f18ddefeb6c8d98a0f07299fee57aa6f5be2e00b6c266ce361e
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 10924 bytes
SHA-256: 306e04e16795b3ac25a2799cd071338a8a059db2dbef39380b98ce10a7dc58ce
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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