Malicious PDF — malware analysis report

Static analysis result for SHA-256 917de44930bf18e9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 16:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30ce5c1ad7142ed0eabc79d7501d9f4f SHA-1: 8132d96a73434e4941688a8fcefb8df0f8e3b48c SHA-256: 917de44930bf18e96728fe0bd600bf3ab9ac7d366f269f05faae97789dd2b4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=compound+sentence+worksheet+2nd+grade PDF link annotation
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609693a61290a---vogojixob.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a362a6763---fugaruvezujiwisemenexux.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/19048060651.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4317a76a4---52495308203.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/23062c9f2a84010e1f4ed73c1726fbce/53861186683.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/vevomodigoje.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdba715cb8---tagorafubax.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/2810173525.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/90180429965.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c14896f6606778150ba0b73bafa6871c/91418514964.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fixofazexesimesafabu.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/88552338402.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c718df449---gomigimexakikovavijabudig.pdfIn PDF document text
    • https://faceless.me/userfiles/files/jalilozed.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/088b88cf958dbaf2cd2b6255a0dea326/91333162125.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/73004889468.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/15224462617.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/dilulasisomememu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/39460314691.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/45593598078.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c3cddb8cc66cd1719440c4e71aae4b59/ketadarutazo.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/nukudaxasagifo.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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 17408 bytes
SHA-256: ce5fc91e78d6c600081763f32fa0f0cc696d79c09c2e5d739fc97ee29e24b838
font_02_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 11252 bytes
SHA-256: eff19cab54fc1eae2e89aa9610f47c40adbb194a31963cd412d241cdfc581159

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