Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0b226ad01dd370…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 05:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b2129b5a0befae8b5cd2386508b4e00 SHA-1: a5852007fa185e0dc7316e93f816987c090d6b02 SHA-256: ec0b226ad01dd370c1fd7671fd56c828d2f3e1b5f2ae6f3b113269080d4c2454
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple distinct hosts and the use of UTM parameters further support the phishing or scam lure pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pohnd9rq8pifa4bpsomfhhocb7/44753962452.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/63a54ef0f981184fcc038fe106a8c7b9/kidofipitodeb.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jimawowosavezagofe.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/64855003241.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/koxapufagusoronetuj.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210730053218.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/sejazexesek.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/taxoxikoxox.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96f9c3900---labelosa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/korm7o8829i2ju9iahg36jbmn1/mumebedaba.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/suzatufexasobezadibitaro.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gstg0fl6gf1mo9enkpjl7im7el/42366260981.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/11695043192.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/12059210769.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/56056402797.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/88654169765.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/66813826043.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/xinibomesivebaxikuvaz.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/58495647265.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/09goeid4mqrp6oijdcsnuerg14/kevodatitenomavoxifopi.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/46842918307.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/gitvkou2c4fjant7mco8ql8p73/pulofufozujujozesezav.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/xobulebobinoguzuxupinemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+importance+of+human+relationsPDF 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_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 17024 bytes
SHA-256: 5265840ac7ef138a012c159d6008edc89ebda0d1d31bd56020fa8e35d70eeb44
font_01_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 10808 bytes
SHA-256: 5f1c6e2b6c82dcd189ad984ea3304d172c2aeb4f444f75d36e4b866541fcd15e
font_02_sfnt_off00013210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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