Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b334ee4013c277…

MALICIOUS

PDF

81.9 KB Created: 2021-08-15 01:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94b16d96b1b0a0975f80ba52e855fba4 SHA-1: 110fe6853b5ebbab093ad2571b78bdd6180cbaef SHA-256: 82b334ee4013c2773e221fa4ebbd06a2dceb4a0ae127957341c385af4f501dfd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that this document is likely part of a link farm strategy, possibly for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bobiniauto.com/userfiles/file/vupepabi.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a3e5ee4c5adaf9ef6449a67dafffd5f6/mevaxuxegeludepuwiri.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/4083677953.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/xufev.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/wekijabuvodepo.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f58bea11029db0125905e5d6aa95bcfc/mabonenukasipopuvadenivoj.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/28675489742.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9b394370---zuvitu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af987774b67---xasenofawikedide.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc0a6e87b---dewufidunumejidivikuziza.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccee3d963e---rawikadumujuwozadokobi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c95bb954239---jefugatumevoxenosexi.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/gejudim.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103074217905---381779241.pdfIn PDF document text
    • http://decalvanphong.com/img_duhoc/files/bodepodunere.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/gedasusepedegulupepawaf.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1dd7b4acc---74722199090.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/57372434560.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/46223210141.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/gulakozovametolunolukum.pdfIn PDF document text
    • https://eurotig.ro/file/37384648596.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/86064929306.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/86303375185.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/kudelebimobalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=play+happy+wheels+3+free+online+gamesPDF 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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 11080 bytes
SHA-256: 939205aef7a68fb127f75370ee359f428971404b2b4d33d9b2a0617d2eb9837b
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 16960 bytes
SHA-256: fc47eed230532376b5d8910c1d0f0c4a052dba28590f14b03576a85b703e2f92
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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