Malicious PDF — malware analysis report

Static analysis result for SHA-256 2353ec93cefe46ec…

MALICIOUS

PDF

145.5 KB Created: 2021-07-18 19:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8463bfd06a787b1ed7f1ca7f60f2ea3 SHA-1: 819b5d361508e42e8d42a633588abca636a2a08b SHA-256: 2353ec93cefe46ec7df0658587f2e7403a41ff1ab553719cf8d1afc7b672dff8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7686fad2---91923981554.pdf In PDF document text
    • http://bensonlandscape.com/editorData/file/63434352126.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4unsq4132rna3jgrlb7f6dn42s/90036718223.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ead6d991f364f247b8893a09128b9dbd/41032330681.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/vesid.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9d604a6d6fd52c41a39944613820b42a/70015527411.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/60394035825.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/vajapufujogeletopafelebu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5374ce0530cdf86dd24f24f08a7b1ac5/semovel.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/66971583912.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a5e16ef5b2d3538670ef35b6d34a3e89/gilibeditisopakabe.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sigopovurogewikemunad.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lk2b9dgf38sfmkrq1122n4soim/35421251561.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/xibup.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b7b62856d---18580034678.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/kulovotujawapuwuke.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s16jbr2v5h0u49id2r74j201rh/88313128726.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/1205248172.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/najupu.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/97433380501.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a38331aca8a---kazupejilamulusimamod.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63756419125.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fc437eb64c74ab8b78e3052128fcd044/wawegofozowofizikekavodi.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/valisavavewud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=first+lander+on+moonPDF 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_off0001d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D700 10388 bytes
SHA-256: 77e9c44f104a582acf108bd0c086e77fc43c53b999a0cdcc5d299af26aec0149
font_01_sfnt_off0001ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE6A 18456 bytes
SHA-256: 494a26de79ed96d5eb4a46f53d5c7c3f9db271a3f16452051cb336201f0332df
font_02_sfnt_off00021f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1