Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ccfddcc73e76a6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 19:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 303abc549454aab4495818069489c24c SHA-1: 730ed471e0d4380cea61d0a49d14320db5d32527 SHA-256: a9ccfddcc73e76a64e4e9d74bc00c33bda6629542e5f175b5126636076a7fd30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://abofahed.com/userfiles/file/66111514397.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2100e85cfff41838c4ace16337e59303/46071130061.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210819223620.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/medabegixibo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db14ff991d6---dagiximinifanofaxig.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108072146422234.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/34027809764.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/gasobawekojuxam.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/porofabezonaridajuxemumeb.pdfIn PDF document text
    • http://gtshotel.it/images/file/ratawazibakipekosej.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7a69a4cff16efc9f511c09e74ebb407f/maruzekukilu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/fudifozejabinojefusu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a0a2ba5728---voxadovotaripisen.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/tivugonivoxuzatej.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb5070001---kuxasamelarebobip.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2947a1a0fbbe3a2ed754959432b02a41/jupovesuwusuje.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kalinusosimesigimugufu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1610f830ca6db2---96273085181.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/46228727974.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/75784127858.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/50166740696.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/74632821528.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920aa36343c---pifolep.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba764b051---ritenanedina.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9d49dfed4408c1e82e23c7bbb9b8951b/82267201085.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/81d89d1582044bfd97c6faef5bbd0e73/84197050801.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac00216d1b---sanamexidamuzibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+u+screen+record+on+iphone+7PDF 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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 18144 bytes
SHA-256: d5e90a7d4ba24437d3f907c005bcacadcdd9850303a84bfe885ec3a4ec27ab74
font_01_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 10532 bytes
SHA-256: 848dad64b5ecb2532519b65e194484bc25dc7c0f66ef939acef180c4f81b333e