Malicious PDF — malware analysis report

Static analysis result for SHA-256 223774a224378dc5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 20:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a42a108fd874657fc65ace7bf582fda SHA-1: e88fc906364ee776461bdea5ed68811b72114b4e SHA-256: 223774a224378dc5c9cb7fb20e5c028e19a904784e317bab34445644070be270
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests a phishing or malware distribution campaign leveraging SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0et8irtm2qjcl88ma8tqvvhgmk/90354686185.pdf In PDF document text
    • https://unosms.us/userfiles/file/gidogoriw.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504014713186007.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/nufijonewovi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8549a77---paxadigimuvowedu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db3b96a8e39---48464228570.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb7578a13---mopovezonisiwemalatapov.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/kuganewonabob.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/60647231076.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/jegizikosuzez.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/db8e08744734302e1dd2ec6250601b06/vaxokelujanosipawuribapos.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03b442edc---70473141674.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5iqn9702d0t1sm4fv8qgjo4ji2/xenozafozipusadedakexad.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/roduk.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tixifowosiponej.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/81392275511.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/fiborowepazunoxorabi.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvipisit.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc39ce0d429---kukozulogibelabafobefu.pdfIn PDF document text
    • http://domplus.su/userfiles/files/96711801271.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a172da26---fotefanom.pdfIn PDF document text
    • http://leguido.net/files/52906640119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+take+out+contacts+with+long+nailsPDF 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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 16792 bytes
SHA-256: 35cef507cf7df12569a7e76afc037a6ce12c7f1313eba71334368456e0982f58
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 10676 bytes
SHA-256: b96e6fa2ca1497869a1f305010713a2075b26dd8811d2d38c7f09700df82b46a
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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