Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35adb4558d50add…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 22:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb2b28d5367c41c821746a7a6aea1e20 SHA-1: 260b921bf82719da112cc387bc4b698ec9d77391 SHA-256: e35adb4558d50add40d5745389d10639877781989aca96f5ebd93f9fe3d6e102
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to numerous other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The presence of multiple unknown URLs suggests a campaign to distribute further malicious content or engage in SEO abuse.

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://laps.pl/userfiles/file/92596938897.pdf In PDF document text
    • http://bio86.fr/userfiles/fichiers/46222946957.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/54338382786.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56676386152.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/gubunafonolivasi.pdfIn PDF document text
    • https://ysh.my/userfiles/file/pavunobibowolik.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/fesazilu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kisijito.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/suferinevolif.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/denazopeweza.pdfIn PDF document text
    • https://scalper.ir/data/files/file/zunilukotivego.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/654b0ac2efe73c402bdf0686728b041b/dasebodopabiwosedaxes.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0b4fef3c69fd680196ea9df4ffaf36ad/nosadalufimiwabin.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/valegituzitifenaferuje.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/44180773999.pdfIn PDF document text
    • https://thietbigas.net/media/files/97814580077.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/38065086598.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/rijuwises.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bcbp7484lihn0dbd94g5jnb8so/mesunukafazavim.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/34771631925.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/fivewegimizafaxol.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/gewojelebizizaj.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/pokebe.pdfIn PDF document text
    • https://renault-service.com/userfiles/83889710123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chemistry+text+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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 17956 bytes
SHA-256: c6a5a037f19c562210dd06f6594d7171930873791bc2f87e7d8cd1f3c57e3368
font_01_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 10576 bytes
SHA-256: b06028bd77a4ea0845751bc673966a07babae1fc8e2b92427ea5f55ab9db1e28

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