Malicious PDF — malware analysis report

Static analysis result for SHA-256 6209ac97e11e54a5…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 04:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d1053ecf5a738758fccd91321ec00c9 SHA-1: 90640d237c43a957f050d571e7550e229958013b SHA-256: 6209ac97e11e54a5d075e8b1ad4d4912ea072b35ef28bb3e9eae1d27e399f239
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm characteristics suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pilot-nav.com/ckfinder/userfiles/files/96820001246.pdf In PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/21667224009.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a034aa59c835fea079c8b2c9caae4aae/buwumuzegafutube.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160727943b8cde---suxowirupobomema.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/j51ef510td239oogm780r2uok4/volagenidimivus.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64e2db184b---96212411084.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea44a4960c---rejamilinomelesapafolu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b6d816b75e6bdb4c9922130b470237db/lamoduvusuritovujorijit.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/81188818190.pdfIn PDF document text
    • http://beiks.info/public/file/telenuwobivakifal.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/remodoxumukeje.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/13543394373.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/63615536135.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/70090257415.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/vikaposomaga.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/2985608440.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/josomolosiwazaxiwekobes.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3bdc4bf33---74611759729.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/gibux.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/n1ldcn1ep1ml4pcjv4n8utrg61/14694960896.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/weluxipamuturutito.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/6589117593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cbse+class+9+science+chapter+1+question+answerPDF 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_off0000b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB583 11192 bytes
SHA-256: f59a098893666dcc61c91fc58c5f4982fd8c18a032d63af84780033f8fa1dc4c
font_01_sfnt_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 15676 bytes
SHA-256: 743174bdc033549db1e684179f59de35addfbbeeba567a32eb0ac90e2264a9e3
font_02_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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