Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d463f38683c9ad…

MALICIOUS

PDF

86.2 KB Created: 2021-08-26 06:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0453c81f7d40bf87ddccb18f8b221d4 SHA-1: 9ee46bc4664fbe73341a79f594bce2c9e529974f SHA-256: 27d463f38683c9ade595bace01c9731e1388283558e757acffec66b3501457d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and compromised CMS upload links strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=3+year+old+vocabulary PDF link annotation
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc86bec05d---pasukuvuju.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/62784802bcef8b9eff24300fb3b3ad43/xoloxodunozupi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc92faf626---71991712438.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2028d82d4---babosoz.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/pupifegalivojowa.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/69326302211.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070af31eb21c---lewebadakopivopujozudato.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae383091d8e---pesuv.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17969945ad---butonafalades.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/lazeliziz.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f2930307c023f30e54d44875fbd5ae78/xifividujegukenalitazu.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/72618673069.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/74812681362.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14584031638.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/wivuluzupadirunorebozan.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/finupidinowobokadujupijam.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gopajexusisevavimas.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962b3826e28---63229370084.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202108212047485096.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/93017239798.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ea1272211c33a9134c292298f94ec7f/jizolam.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/7912976337.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/kerorifokolugepabijegu.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 16744 bytes
SHA-256: 690264bcb9c8fa64fc8e6f6b1b7b7faf37acec78dc91a25b6ec02077c232ce71
font_01_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 10396 bytes
SHA-256: 2db172e5541222d108a375bd4cbcd8d7afbf7e8d40e355ac93bc827ee6566735

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