Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d42b2e54fecc2a1…

MALICIOUS

PDF

114.0 KB Created: 2021-06-30 05:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a3c90953cff3c79208e6f6a68be508ae SHA-1: 35266b12e639c6f5842358c28912429d69bcf2b9 SHA-256: 6d42b2e54fecc2a1a57df749193dbcbe0cd6cf3950ef26295fa93cdc0108a767
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicating an attempt to host and distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or delivering a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28290ad1b---85213287361.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aa064a42a607c636fe36e1b89ef748d2/tupak.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff2e137dc---67839271644.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a1707ee56987c92c7a9a99ed35a486e1/vaxaganelav.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kilibafivib.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/gakik.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/21162913652.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077282b8021c---20313236774.pdfIn PDF document text
    • http://learningkey.org/userfiles/pivetibaxepanizago.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/33927706365.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/82883540650.pdfIn PDF document text
    • http://alkanboya.com/files/file///gezulatefib.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/71807621150.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7ce111269eb38ac71405983bb5d54101/93014484117.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/gigodotujagemevul.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608045275b975---raboxifu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/156c0ed0534cd1a95ff5a79d92026db0/puvafinibuj.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d084c2b79---9464090666.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vpmi7aoqvosss0herg7hnc6seo/ganizakobibut.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/sazeb.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/kevoredopotixulimexew.pdfIn PDF document text
    • http://sgpeo.pl/users//file/loxugowagupipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=activated+carbon+filter+design+calculation+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_off0001557b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557B 19320 bytes
SHA-256: 17d2c6450c2edc1252be8d5b1773adcf14441ad1b69041ee9648e24b18f99251
font_01_sfnt_off0001890f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1890F 11084 bytes
SHA-256: ca1ebe80b5e257098d806e0209936b360b089bf793cffc6e9e4f1dfd8f26ba05
font_02_sfnt_off0001a2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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