Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f40b45cf2e8eda…

MALICIOUS

PDF

83.5 KB Created: 2021-08-21 11:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 40db3acccdbf363338f9d6741839c29f SHA-1: 28e5683dec92c3e1e12e67617e1837e2f415e6da SHA-256: 68f40b45cf2e8eda7b21b0244290f2899582f8f18fcfd8dc2ddbe41fa77a97a4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to external malicious resources, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf09faa99b---54687694701.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fa79984d---losozape.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/08/file/20210708_044536_128.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/72621814106.pdfIn PDF document text
    • https://wrd13.com/force/file/kiroxuzazezosenogek.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/51966377457.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09e97c534---62024731073.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/64345591157.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd43db3d33---80201600320.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/rufutixosenopiva.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f7750ab2---98587610772.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d6057f796ec1e561d310887f4f924ce4/19892069928.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/21d8491db68d745cf2ce8149501b47cd/bomudobizixaxil.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c9e4d8f9b---50428822706.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/fibubevogusaparixutabal.pdfIn PDF document text
    • http://prota.ru/upload/files/75591250310.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/limolabu.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/rinawoforafexakosojajo.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/napalov.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ecc4ad0---zetifanavuwadetupa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161165e3f0a60b---togowofomulomaluvesi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7cae9b8d---rovabolaguketegapivupu.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/18926889371.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/5872749293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=why+chcl3+is+polarPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2ef35c866fee0ed37a636d113db604bc/telajipof.pdfIn PDF document text
    • 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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 17512 bytes
SHA-256: 4a9c3af2f1343ce9866387d318aac59596f600b1ca8fe02414616089c4d66181
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 10416 bytes
SHA-256: 33735d12ef07e9e619d1307de26164f8e2c7312858e0503abc148e1d74ae3c26
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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