Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3188285c54db8e4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 01:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d1a0e81288aed9adf58c4a06e814b5b SHA-1: 372ee6d3981740249bc70b6a44785bfa22c16fbc SHA-256: a3188285c54db8e43c94569b335b2d736b599e502c59aba08594004ec198ef62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple external URIs and link farm heuristics points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ljlconst.com/admin/images/file/gumeduloputukamozupidedo.pdf In PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/59106606900.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/fesubi.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zusubise.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/56640475247.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/20081097255.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8e9d46b6---98972033608.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f64dc0ef966af2f29ed668e01909e1d/kasovafufozemaxuzepoki.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/18200320967.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pixaloseriwedi.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/13821997734.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/15483679e14cf13aaaf2efba8f4ab25f/jamosebejimatovomexe.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/mirowe.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/tisokowegibegodanofelewu.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/30405749473.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/70719380154.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/45434924480.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/31854658252.pdfIn PDF document text
    • https://lecachet.fr/docs/files/68796333516.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109090837385575.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/51664452551.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/rodobuwunite.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/vojuvevuladabaj.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ku1j3h2nrosl9htld6rg0r3jqv/65491996088.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gutatem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ben+10+up+to+speed+app+downloadPDF 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_off0000cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 17144 bytes
SHA-256: 7c9cdbbd8b009343e23e9274fe0ecddd28ddf743eca9589c9faa68d9179c9050
font_01_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 10608 bytes
SHA-256: be36ebe44f9c48c40bcf6cf21f4430cc1498b1b7277cbfc116313014b9c0eae6
font_02_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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