Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8481504b4173aa6…

MALICIOUS

PDF

74.4 KB Created: 2021-07-17 20:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7adc028be46cdc652e8ffa3bac04fce3 SHA-1: a21017205fc7d2f51d77f367f2867334c9583bc3 SHA-256: a8481504b4173aa6bf966cbdb45276ac1119beb3a9ba4f63c1cfe3776267b5f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aawyx.com/sites/default/imageuser/file/lebonibuxape.pdf In PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9aab64b8f5b93e05558bab8fd5a97fc8/29395144824.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/dagurazegefomu.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/11609397032.pdfIn PDF document text
    • http://islandpointfl.com/userimages/fujurekoderifipizepa.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/38340515094.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2d8702b53---difixosidi.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/mipuvidujalenadoleniwer.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/7237508865.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/60748100629.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d72c65a92---goradajekerudizisif.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5be1c777bdd900cdc86e63db916f5598/zolavadixikifinez.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d007c01b---tirot.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zabimiru.pdfIn PDF document text
    • http://primaneighbors.com/userimages/50363446298.pdfIn PDF document text
    • https://irantruck.ir/data/file/finatupelesedelopofanodit.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/28403438173.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kexarewajufimosukik.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210626094704.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/galefubotuwe.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8khig6vvh5j13okbs1veg578va/87574773541.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l7mpl9fi4g17ffak9jnvnkc6o8/42791488047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=another+word+for+very+usefulPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/muwetisemopopamosedumu.pdfIn PDF document text
    • 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_off0000bec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 10544 bytes
SHA-256: cbeccfbff003bc8715625407e6b1005bfd576e91be78205bd933d55872702bf0
font_02_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16912 bytes
SHA-256: 57e76fbf7ea2bb77536e7d11448e749e8ac90160c3eb386126613d81d86c5274

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