Malicious PDF — malware analysis report

Static analysis result for SHA-256 94787ea4ef879d73…

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 20:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f05b14ef56b8fb5b14feeb157aa68b1 SHA-1: e7f635a5cf7b1fc46c35ac342852f5f9fc2f2f93 SHA-256: 94787ea4ef879d736d9291801cbac5445dfc2bfa857173bc8608f84d342eac44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3282d0798---gozafutoxu.pdf In PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t9vgf43oli00pcebulaebuc2p3/25753518049.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3869dd73f7b7b682c0fe98af9316aad/21263622782.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4cc9a784dee110244180478f28f5ea14/jaritawopulugebipijek.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e842e0f4---54839620474.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/4079210488.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jecb5hi25c2ubjun3tm8ovv840/nemej.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42b342978---gosawumibuzopog.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a733cb251---88752834516.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/11184290160.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/jevojawejajekijifunowug.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/72562509823.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/55286822213.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/34643359281.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/64b4b143e2bfaaffa2bbe26b111c4b53/7287845505.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8cfa9a19a789e450802cec7b07c444f9/17156928511.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b78030b3f---1397098974.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/efdbb99eee882f881fc38ced9a711bd2/45518117924.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nogosemujene.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3cf5c7805---josutokeruzavagokugi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8e9c4d828ceb28223b0477b9a11ac966/pobivubed.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/mavexajepunadejejipuvu.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/12202304730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=worksheet+on+lcm+and+hcf+for+grade+6PDF 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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 18012 bytes
SHA-256: 1b779d09370051956f91971b15becee0e63ab7b50dda8465cfd1ef180b5565d7
font_01_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 11084 bytes
SHA-256: 974560f74d9aa4fff4c95760b7d61e104234c8c46a2c2548a799d1065d38c361