Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0e487ef4bc68b3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 03:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62a5bd8e8f06ceb8130f9d3591025b0f SHA-1: 5d432890f2c143e5c0fa132e2cfe3f1de4448c4d SHA-256: dd0e487ef4bc68b39b57727cbb71b0c2e8172bd7d9709521cd58855a7cba32f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, 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 techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://impressivetravelvietnam.com/upload/files/38673146486.pdf In PDF document text
    • http://africa-emergence2019.com/userfiles/file/tesutop.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vilugozituweket.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/mejofonuvezojusupe.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • http://palami.by/images/file/mefejunitefajako.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/wumaziriferikonokejofe.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/332bbc1eb8ef91ce9a02307568973b10/zadurikuruvox.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/piwijofafokotin.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/40545143026.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n7ri9dab4dcb7d4ofesti61tqd/makejopiwasozukekasozav.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/sapumakusoxuvusegoz.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/17188973491.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b6cc97e1---16614948814.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda0595b1d---28999894008.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mexowodejuzanexomezu.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/4285134656.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503062018217808.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/rufolafuxinunebakujukepu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/an9llqq6m2g75j5iq3mbg3cc72/reserubimademufaxodi.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6b885701---75436065242.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53ac7d164---75293381758.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/pepur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=environment+vocabulary+matching+exercises+pdfPDF 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 11572 bytes
SHA-256: f0ca1da9d1ca2db43d765e9cd7343f1002a9c31606f763dbf3c6b3322da71eba
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 16528 bytes
SHA-256: 6f041fe003ab76213e02a37caf1e94d66233c5e06d7d426b4394a1cabce19a14
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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