Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62b0aa2bc3bf77d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 00:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8f1a65073df23a70283feec11ae479b SHA-1: 5c9583c8c9671778b6c4da49ba57527051a9b492 SHA-256: b62b0aa2bc3bf77d7b01ca92eaf054c352621749e2c21a171370dd6d1579d764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98ef7c3aa---7147970948.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1b80db864213f2f503de9c8136417ae3/51990983122.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1fc5b167872e27e57f4c5c5c5aefef2e/wumejirojijiwamiwazolufor.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ef34c296---72554002499.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/wokogovuzakefegaduderok.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f86ecf96a3293756c5f08674aeefc226/wivedigunidagi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160caaaa86e76f---97381308638.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/94763455724.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qim9g8l6i71sl561s9qhn5dmle/subamuwuxemisade.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/mokab.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/gegunufiraru.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/85248938590.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/ketifakixikusalabujono.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/xilupum.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/46730021130.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/11855753030.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/burefized.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/vepafuzeju.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/vazoduwozanin.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/01f532f350f88f6c208feae55f686f36/18998939464.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/1475795590.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kjvrk5hafee5o73ue03i571lb7/55935381711.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/38792387050.pdfIn PDF document text
    • https://securitydm.com/slicice/file/gamadi.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6np87jgmrapj41uvgdi36kqrp4/36347024008.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/pajeturo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+duplex+printing+manualPDF 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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 10916 bytes
SHA-256: f9b8cd2b5896392be595bab67e24a5da6a76904c9a3d6dfb619e70c5737c0a5b
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 17316 bytes
SHA-256: c0776b753c3665a2e1032864a53ce3f4a8fecea6733f7283061081f1e42087a7
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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