Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2da108a27ef26f…

MALICIOUS

PDF

102.1 KB Created: 2021-06-08 19:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9aa99b8fe7b83417a2b08b648ccef017 SHA-1: 9f824855746f7bdbab2f7acbba1f82547b3e229a SHA-256: bc2da108a27ef26f1ba10a776d10313e7c185f34012d2f9ace5aaba5a55749e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9994

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://smidgel.ru/uplcv?utm_term=subtitles+of+vampire+diaries+season+1 PDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc3e793a6---sifubologuwixowo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2a3qeobnq6cv1jqt15p5tqkjhd/bojozasedisorafade.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pb2atrrkjgobn94cqclaftii47/sunezulovibeninudoxisa.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e88c6d8c6c0b82d333cc6159f68d1192/ditodawozati.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cu4lj1a93s78hg8kvm88i9icc3/dozuvew.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cb577d17d6469fb5622d239eab0a1a45/38036178479.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/valimitaxevolejukojo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vg093f4mtdhihg46od9d7bi3b9/97934045067.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/9293358866.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a6743a5265bb9799da90f2d19c1ec0fb/54350717265.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4883f1c9---28350623804.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/o4j30lj5dnaks45ihiuehlrmvq/16516939398.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607775cd0fdcc---41615148722.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1cf1f46b---92307126368.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609215f989b3e---zisexanowezapof.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/mabadag.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/gazokitulinopolagekav.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719831eb201---34698831579.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/62f094bc8dc714783366d35a2c8da81d/voberapitanatijiruz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015794.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15794 26780 bytes
SHA-256: cff7a2f23966000dbb975c5a402fe0947d227940c835b78076b827be1c73a1c9
font_00_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 5540 bytes
SHA-256: 338527f71384089f1bfc28f5b23a3ce2750f055bdbba5d278fd955adc22857ce
font_02_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 1704 bytes
SHA-256: 56f9fb540e7e5657ca6fab4e7ef541bdf9a30eefbef2b54e1ac577addb6899d9
font_03_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 12040 bytes
SHA-256: 0f062a318c637f5eaf94a41e9ba103ae6968b7840691ef979619426989f93c17

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