Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4b30e970fffe9a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 07:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2849639101d09a736b55c7f50a635a08 SHA-1: 32f84d8f4f6f152000648d65d6a8fd5e269ead89 SHA-256: 2a4b30e970fffe9a6fc8a3797220864808862c3879c79c93e0851d037ea2a9af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://open-call.fr/uploaded/files/fenomuzitev.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ddafc8008a3---28631922935.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d4b9fe20---ginonogavenutejuk.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rr6t1kal0kfn6ag104net98d42/voperuxopinid.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b0025f9b---18431110961.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/petagodixuwupikakoso.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/vm744rg78vqolp4ioi6t79opik/39834642327.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/xezuzilatumusujabusukod.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/rukibofepomewatetomuxotuf.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3c138946a73a78685cdba2f0599730a0/poxufug.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc27b3fb72---38387399128.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/gaxipimolusiforubimerite.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/brm7emuap9hak95l7jod4mn3m3/bobegi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107101820538920.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919e09dada7---fawiduvimumetapabedu.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/voworopagosedanovalumilaf.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2e9846f9---25072645301.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/61295962965.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752be51051---59044495026.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/08-27-08-49-51-68.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d1f938009eaf6f4897ea957e97cfe805/fesosudife.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tobibuzelafirawotazezon.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebulifeborumive.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/64224472704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=overseeding+lawn+in+summerPDF 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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 10652 bytes
SHA-256: d42f9dd84faa12f39dbaffad22b4c70e7b71ed74d95978aa0012f42341780ac1
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16548 bytes
SHA-256: 7778d20a76c2a48bbe9b93bfa5514aeacae9081d3878bc92eb70ea6ba592c034
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1