Malicious PDF — malware analysis report

Static analysis result for SHA-256 1127f88b5ceb9c9a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 02:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 297c3f3027d85dc489d3061a4c35e659 SHA-1: 537b8ff50f0cd66963839f354f14d6b6d200b5b4 SHA-256: 1127f88b5ceb9c9a7bd513b218f4abf6f7c3c98cc569a3f130079c94bd52836f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dm288.rs/slicice/file/pebax.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ece5a77---gebafewepox.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/dapunabiwama.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/jibudovaki.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/5428298442.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b75327611abcbdaea440f857769db358/zegirajirasiwuz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf0e196cd2---puvimuxowiz.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/zaporupukujepakez.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/manovexaxegupunowife.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/0j9h8aj7ge8m6iqjpgpu8q3vj8/11199818919.pdfIn PDF document text
    • https://webmenuplus.com/images/file/74491770599.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/geloritax.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/76047106667.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/8232449398.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/65449910037.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/9moobcshk9s6jdgvon7b3b4042/59556559069.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/pozofawujiketubumoj.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/wakowilowufiwe.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/58c60a59c8079aa6994d20a5e11286ce/67897847443.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/ridiludujodemupiribubotup.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5c5a38450c8d5abbfaeba237498d9f80/wiwutebije.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/653565c8f70b92ac47a58184914cd142/jakokofo.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/34817534162.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/9619202089.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/74348514436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=whirlpool+duet+dryer+service+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_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 11052 bytes
SHA-256: 448953af68ee24f4e259fa4df4e475f7b9bc83f050eb7fa14b85fe1e70bc6b70
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 17592 bytes
SHA-256: 545e25f6700521ec11abe20ac163f0480a1296531700a7b919b36b9082fde02e
font_02_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1