Malicious PDF — malware analysis report

Static analysis result for SHA-256 26153c7042a738db…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 08:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 390251b510597fe4709e8e90869ac68b SHA-1: 0934b7cbf144520cf1334be86f61a298a8233c85 SHA-256: 26153c7042a738db2563b12954da08a872f2e95905f59447986f9be627641d30
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=car+parking+multiplayer+hack+money+apk PDF link annotation
    • http://hosungtour.net/FileData/ckfinder/files/20210920_97CF9EAB6AC0DDB2.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091913283073499.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/51106309339.pdfIn PDF document text
    • http://moretonassets.net/userfiles/97188794010.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614224c335069---fisuxefadijeletori.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dapojotuz.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/81741896589.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210921081703.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/11674960715.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/45635388630.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58419049496.pdfIn PDF document text
    • http://abc-tel.ru/data/File/86584210456.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f14f4fb0b---23212281176.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/labex.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/78379975888.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/neseradamafiporugowoduja.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614930cc5ef3c---41419241108.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/83757115142.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b329c1e83---binupofinonop.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/83638706409.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/40457471463.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/53166035356.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/busiveweravivejazo.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/tosedagejilozukedejuteg.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 17008 bytes
SHA-256: e9d581d33413b5c8545e19d460dea2c650c3bd435563fe38ebc738ed29678a3c
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 10988 bytes
SHA-256: f3e4fc2a099cf055ff86959cc6776dd53ff89ba614b74c5c0b50fbd15c8c40f7
font_02_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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