Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f41f19097ab94c…

MALICIOUS

PDF

100.0 KB Created: 2021-06-30 23:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd86483cb0f06c24ebc047ca57256676 SHA-1: 8db29d7c420392047ffb3ccabafd8a1dfad13464 SHA-256: 66f41f19097ab94c84bd5d2c345cf51273daece4838c40e5b1f87b0c072157a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://bangprice.combangprice.com/beta/cms_image/file/27085406538.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438245c4a1---nosodozikov.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a748ff20b3f---tupamakunakimavoperami.pdf
    • http://galluccifaibano.it/userfiles/file/12472179296.pdf
    • http://phayaotechno.com/UserFiles/File/93894580117.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568922464a---lekogupuk.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160768b1b922b8---lebojediraso.pdf
    • http://geredekombiservisi.com/userfiles/file/muwuzawijedavu.pdf
    • http://al-bandak.com/userfiles/file/zabixupokogijegadira.pdf
    • http://www.tekkoo.net/images/library/File/42551000528.pdf
    • https://chris-arnold.com/userfiles/file/segomidisetubixo.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/tiroxomegofogirelevuvol.pdf
    • http://cpils.com/userfiles/file/91143570746.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a65553f67---39622160472.pdf
    • http://www.annaleehuber.com/content_files/file/23223148295.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/latabaniwositoru.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/33857078594968792c48ab7159a2b217/guziburexinevamuni.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/80020f3b0415c58a19435df97bf24074/fugijenuku.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d84d7a0f097---xewadasezavomevebozogox.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/eov9k8imon3s3p16jg0k2tfm8f/sujuzefigaridajonakelali.pdf
    • http://driver-jazda.pl/upload/file/32654783672.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3ui2k7kmman2bh7ev0319g0946/zejotewulililezipogap.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/98ba4e37b314af5a01d1502831bf5a5d/livasunusurupadatowuvap.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2ec75ac076e706b912f1328604fd492f/95628702465.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ab1c2df3---7807612927.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=coffee+meets+bagel+she+likes+you
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1e189928127afada00906cfd44bedd03/97466961342.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_off0001266a.bin
7e14fa33438578f5c2d545a4e0c44f81e3698d61039f4a6a9876a8c650868a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16620 bytes
font_01_sfnt_off00015111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15111 16792 bytes
font_02_sfnt_off00016928.bin
ba41cd63abec625e4d248730fc7305c06939782c905666ca3290177d54efab79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16928 10936 bytes

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