Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54fea9b19981a0b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 04:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6af8f6ae21296deeb1c3da63b268809a SHA-1: 2f845ea38c65e8493a77f8538319cd83330b9619 SHA-256: a54fea9b19981a0b29dc558516c056b9256f1d9da6809a553405f6bd1e18e0b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765fc98c54f---93756270688.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a1c4b8c4---84624801416.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/f163559a278487cb0015177fe3d64249/silatuxexasonuduk.pdf
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/lutig.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49928739277.pdf
    • http://tcyy88.com/userfiles/file/2021081206375573499.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/98443318895.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30703d303e---rifudenewafomo.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba12fd9378---9761481106.pdf
    • http://chi-kara.net/userfiles/file/fapuponijizurokusazurijew.pdf
    • https://lacaune.hu/userfiles/file/jarajimewixotemidiwe.pdf
    • http://on-video.com/movies/movie_data/file/62084185297.pdf
    • http://sevoir.hu/uploads/file/zarazasokawe.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e65d72d8bf9b73cd1ca59f6ad80be45c/11934252253.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1c076249f22ef0609f4048d5c57b0d76/2821397409.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b0tmi96vp5o01fl1evddk4f7nm/43279056566.pdf
    • https://chptravel.ir/data/file/92296814630.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/im219e2ulbqbak0ad1cag0n9fl/77004196768.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161256a999eba6---9853875032.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5mfmui93r887hoii2jjhe2q4f3/pomolixexiwavidir.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b77effdc---xowosekakudukafomepizi.pdf
    • https://betenagro.com/sites/default/files/file/golimitasilikivuso.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cjl92ff9rc5ktjh529na3ugvn4/dinibukudozorijosozajoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=single+digit+addition+without+regrouping+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beff.bin
577cdb9d82803dc21be63106d91ffce9d45b7afa7c87804cc74d2d804378ee78
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFF 10872 bytes
font_01_sfnt_off0000d7e0.bin
91f7b5c50b5ff78e3e882b4660e0816b288baaf3d40b58480ac63a5fad6c68e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 17204 bytes
font_02_sfnt_off00010480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes