Malicious PDF — malware analysis report

Static analysis result for SHA-256 162969aa7fb05f10…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 16:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ccca2aeac729d117e50523469588577 SHA-1: 251fb92cf6a199e928ab6626e5e100268add4d4a SHA-256: 162969aa7fb05f10b221be33c5f503158b492d8224d7a55194de791c0ffcd63f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=limbo+game+for+android+mobile PDF link annotation
    • https://rosewoodcity.org/nbloom/fckuploads/file/ledesesexorir.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614185e56e42b---rawulozudegex.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/63159221319.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/pitadinimasodutusorobuzi.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/gapijavovomeva.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/sibekagadavifabazoriwudam.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/89687693260.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a90de27---gafarizalaxokemozuwurofe.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/81005113068.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/78412205643.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/16602355150.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/23148275735.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/90626883719.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/71069468741.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/617626121.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/2807033651.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/4571183618.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/67251191653.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/77273171878.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/navozenajunagupinogusolu.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/gisitewavojebaxipemamamep.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/fosofim.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe94310a5---vusob.pdfIn PDF document text
    • https://people11people.gr/uploads/File/zepuzadape.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/besimofetisol.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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 10528 bytes
SHA-256: 87d19b7a085abcf5056c5358a3463d96d05daf64c79994d58c3c229e069ee0ea
font_02_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 17040 bytes
SHA-256: 6a627d674360fa47620372441fa6654cd9b5c844c0fe35604441fb4ac89ca554

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