Malicious PDF — malware analysis report

Static analysis result for SHA-256 792b9ce6dcdfe802…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 14:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a28315dcc7bf166f8cc5e841c2b8a182 SHA-1: 1f840d0cb75a28264e9f721ea33f3b2b96920593 SHA-256: 792b9ce6dcdfe8025205e33bec7f2c8e2623074156008e639e598936b400518d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress upload directories, indicating a potential distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bloomlight.pl/_bloom/file/71166531850.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d14d0a25---betutubur.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/ledumorukenazogokawabel.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/69240544352.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/306405693.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/ruvabiwukefagobevim.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/jemovewerorutamuwanuzeni.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/vulimuxufivokigurupeje.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/48763559575.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/37292339647.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/guxugusebajakebaxu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/84219921922.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/83692138708.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a54e34f1d27a0a464ca2e421f6930f86/gudodobubedenuzijikepulo.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/masovekenaxi.pdfIn PDF document text
    • https://razredna-nastava.net/files/75606300273.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nerot.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/pixafirewalesuxugodi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134953eae4d6---paxeraxup.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zowukuteloginapisuvux.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/tutemofudomosabitofi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e26eb87f---fojugumerowisevi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///35807023916.pdfIn PDF document text
    • https://eetravel.net/file/laduxefunavoxikedokuwi.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/11929352154.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/76432865342.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/minadanatarimel.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/lififodin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=8+ball+pool+game+offlinePDF 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 10588 bytes
SHA-256: e476382c605502c939137238ecd07490ae9e67332ae47807a4648af40ffbede7
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16360 bytes
SHA-256: 6f6e3ffee38e3061f6493e8c63461d7b8b36a040b2439ccba707607708f51c23
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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