Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19b0ca3dcb36e61…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 10:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e4f4b129d02ce65fdcaec236d25836a SHA-1: 1de7657d248dc03266b1efc9d227ea8ae59ad9f6 SHA-256: a19b0ca3dcb36e61562e3abf1dc6705d0fae36d7befa4393703f4f277230e96a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://art-gallery.mn/uploads/files/89073544887.pdf In PDF document text
    • http://pnlestari.com/visitbali/image/files/15106466995.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/4310212142.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/lumovarozenojowugoluzurag.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/42000014432.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/84385149867.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m3u0a6lvsa2355uoprgovtlip2/54865588759.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/gisejesulog.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/madopa.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/40082500537.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/19978063059.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f7f88da8a130df423289ec2f6e9dc071/89579191824.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/bogigatemaluxudow.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tezuvusaremofuteditevi.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/92382305438.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7451kultb61acbajuluomodtn/vanetenozus.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ccbee599c---52164299892.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/91346958524.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210906100841.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/potidubusunoluwenegasapef.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2f580e90---lukamipel.pdfIn PDF document text
    • https://phunhai.net/upload/files/46275916837.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/lufapuxeziro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+themes+google+playPDF 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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 16892 bytes
SHA-256: 96a2400f1141c5c40a390b973b995502686dc0fdd8d2f0d440cda40b46cfba7e
font_02_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 10936 bytes
SHA-256: 2456f9d724644f3c326aee4801aed7701a7ea4db4f29dd6aff23b951fdbe8254