Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b0d762616ab60a…

MALICIOUS

PDF

92.9 KB Created: 2021-08-13 13:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd32ee46b075bfffb207a9bc7d5bc806 SHA-1: 59a4cebc8e6ff944a8e1a32f8518b72e18d608ba SHA-256: 77b0d762616ab60a6ef239b5b21bd59fe4539bb76d7d86896c6892febdb71f6b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to external, potentially malicious, websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2300b29e9b44a6f5b3d7f41b0eeca6c0/70008464361.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078853e68986---diwewireloli.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k2cvq03m28u16ki7g6sps6ids2/selefalogasuneva.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a4d192fe92077291edf185fe33d95d93/nozedowovurul.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0fcafaae8d53cf18d997b7c3b992411c/92698087730.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/lenajakamavenimaxipedo.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d202e627b63c5644b3c16295523569d9/jirejijepegedifazatodu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/tusanekuxazeja.pdfIn PDF document text
    • https://yuss.it/file/20642098416.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d239bfa197e9daf7e16487caceb92b0d/46880176368.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/49087006947.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a525d469e6---xafofenukuxugepomomikewu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4975bbb13---89502945550.pdfIn PDF document text
    • http://chpcentre.com/files/file/74305270130.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3122daeeff---11573820968.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/874aa6e8f2a934eca5efa94005b1708f/remidonamapolu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16085d88d43d66---nazasi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ca660ca9d4ec72c8dda3128d5af20c15/zajedakorajemow.pdfIn PDF document text
    • http://gewald.ru/content/Files/11477533775.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/kk6vehku71rtukssbdob0bl81t/tinuwifojix.pdfIn PDF document text
    • http://thongthien.vn/upload/files/68704945978.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/lutonojowipil.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd352563de---duvezerumatigarimofaxo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/nupimolo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/52585292481.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/54998019024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=windows+10+pro+pre+activated+iso+file+downloadPDF 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_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16888 bytes
SHA-256: 0ecdd4f0032d21e428b3129a4bef80d6223f12187ecdbfd391ad17d939434474
font_01_sfnt_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 10932 bytes
SHA-256: b576c5f4ccd7268f4e3ea918c6b0a7c3ae3ba103faac0d2f91fd227c659c8b98
font_02_sfnt_off00014c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1