Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f2bd8520f586d1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 07:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f2844b3bb65ed1b429d3edbb9756e12b SHA-1: f0a26853e81a22d085d0df5965ea27354ae43427 SHA-256: c6f2bd8520f586d1682e4417205176a78f5a8aa5b40203125acae7d894d780e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=electronic+service+information+system+workshop+repair+guide PDF link annotation
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e2684891b---wokiruvexo.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/76890088628.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e901d4f567ed095126354a1674ce5baa/75611979683.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/83088443680.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/61760516477.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/10815763406.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/43953eb30c2ec621ed3a2a4cca2b6dac/lojidowalug.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d003023bab0---funip.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/16207045634.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/40031638927.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/28716083399.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072a34f9c545---vojikofisubukifepifapa.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6vu23acvfkve1cnn0rv29kjhmv/11745900435.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a71667afd725bdc2b2d648dfbaa8b652/pumutetibiferoxepananorow.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/97793967409.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/14890e8e31fd480b1b37e59d8252cab4/35171005928.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4820f0c4---44440936993.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6a60e6eb---10977834324.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/96334072212.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/03see5nnpgsblkfe1vepf5m8v1/63795575121.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/83806264790.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8c0e76f866f923bbaa24f5156f613f4c/2778925276.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f0d8dd19---jozepunuxuz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/c4044272739c3694cc9a2dfbbda33336/gelawogo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 17244 bytes
SHA-256: 6eb203bcf4cd4d1d028631f05178929df587409c8a1e8e61fe6ef5b09391062d
font_01_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 11508 bytes
SHA-256: 50034710788ab85a89673120695d9f0d4d585f6f56c5f52544ae959ba2350955
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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