Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a48861e2065cb41…

MALICIOUS

PDF

99.3 KB Created: 2021-08-06 23:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8226da11aec200aaa1134d57139dd22 SHA-1: ca9659ff083aae3255636ba0390905160a299b74 SHA-256: 9a48861e2065cb416dbad6cf587eec385032b68f6926164550245aa4ceb4e1bd
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest the primary goal is to redirect users to potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://calhi1977.com/clients/879053/File/lilalutememesosubi.pdf In PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/remitalasilanesuxadoja.pdfIn PDF document text
    • https://energooptima.hu/upload/File/sozamewofilegibas.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607124ec890b7---36479712927.pdfIn PDF document text
    • http://htwy.com/upload/file/7893264167.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/67ec7152ded519860b25283a9ee85044/82400759406.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fuvalokonativabisosimit.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/repewugewazepe.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/15242952865.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pomomo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1970d23d1---4717776462.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/xoneru.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e448b2ec099---ninutivewobipexawon.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5189716590.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/52688ecff3294dc5393703ef6f13e6bd/benelumudi.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/luneziposimof.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d2328977393---fopigajitezesuxupitemik.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d986e0ffec---mipuxitaferakekoni.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/bofamivagumerejomawobogi.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/faxobuku.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/dc385e393be1e0355ca946f5ce684be3/ribijisebakaz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071cded98c52---76952141124.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/renusago.pdfIn PDF document text
    • http://faradbox.pl/files/file/85915553092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=abu+sadam+whatsapp+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 10732 bytes
SHA-256: bbe4c02dd3c79b70a016e734418b94b39559fcc196d31710208ebe3d302791c8
font_01_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 17088 bytes
SHA-256: c9f604168420d95048a8eb050f274abfa6ba2564dd96e6d574d634e407c8859b
font_03_sfnt_off000168e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E3 16080 bytes
SHA-256: b1c6688c4117b2eb132fe321d6e5c0cba7066824bbd4880a4905979a2499efec