Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0a1e8825108ab1…

MALICIOUS

PDF

94.4 KB Created: 2021-06-29 08:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0589ea0adead5ab581a0f4b0d8ce4cb4 SHA-1: 3dc90861776e3ab0f2c309b5bf137a2038004684 SHA-256: 8f0a1e8825108ab192701591146ddd1b2ada3cdc1f37a474ee50ae3fa16c4968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://huntic.ru/uplcv?utm_term=have+some+respect PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2ce4af56---29711395170.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50cd1ae6f---80162668462.pdfIn PDF document text
    • https://davaocarrental.com/images/file/92878677278.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a416973216---46886385093.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cab5af34e6d---26198875785.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a627e0a33e3---doraz.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4da577b2fe2a2796fe59d0481f9e4d52/33773875160.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607633fa1e5fe---dozojabi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f130ad53---77991103542.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/nanisirulomokonofuriwugo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160911ae4c1136---dageleri.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61e442f3a---wideruninipemafo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097237534201---85849789345.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/39344713561.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/l2gggib6b2fhp3nopobi4gv4kc/57236735236.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/vazuxonimoludugajub.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/nutasoxosaliladidalapawe.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160736f0450c2d---40791474110.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5557d875e9---87961181089.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/59am773kot8lpsq55bl9fp0r0n/26136293995.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/62095904247.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/46bd8eb07228e30a648b0c7a749884fb/fibolumidaru.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c58c83a9df5642904670cbd931b5021a/zikiwulejefutubevo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc316d4ac2---22127467403.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/16451907266.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd6debc64---pawinotijuz.pdfIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10348 bytes
SHA-256: 2537d9ff280dd2052dbadac807275f26a2eb75a649e88591fbec39c2753d1a0f
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 23960 bytes
SHA-256: d64a68109f9eeae8504e9d4e0fcfad45cbf934a707d226dd65756f451953519d
font_03_sfnt_off00014919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14919 11284 bytes
SHA-256: e122beefd52ccdabc474f956598eb213e7d0baf6999eb258443be1b70dc612f8

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