Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f30599d16df9b0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 16:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b93ba1add3bc462b4837897c389dd74e SHA-1: c2f5ddf82f9153c5dacdb8f4eb14bfdd008e63ca SHA-256: f1f30599d16df9b00edd8a5e774f2da7a514b8851e86c75e8dd65943106060da
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ondrejkocar.cz/img/file/26443215224.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d7bdd04142cb2bb81792cd13492311a5/gixusunalimelenusupujixap.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/wozelilitapomitonuj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e4fc764ea4fa58390fa1092430af97a1/kepifadagusiv.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/93909669797.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a673a48c0---xugubonokuwusifofiguzagik.pdfIn PDF document text
    • http://electric-kernbichler.at/57788791944.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b6640c72---62627960898.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e595c4722---86554949374.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/41762cb2d9f9d03648f43c2a9d3b6fa0/toxidefagitewovujasu.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/77789302848.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ac146548d---75753591645.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21d3eba2f0---39527065049.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609830e6379af---50033991382.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/tebukisonibibapu.pdfIn PDF document text
    • http://schokobrunnen.com/idata/16604675618.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/wosujexajiji.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/wenak.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/83026970843.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5aa795513c7db38e1ded655c96a0849f/54210038160.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/jipaxamodejejurifejubogo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a132dc289c---dedonabitebagatag.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/89569301144.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/73119903848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=8+letter+words+starting+with+evPDF 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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10788 bytes
SHA-256: fb8cfa4b8f89d9ea6d47a9bbb0bcb5061710c90d5455d4d028dedc4c53abc4c9
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 17956 bytes
SHA-256: 0f350fe334d672f63694136f208ec2e055fddbf4d827aa659bad8c1c4704e156
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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