Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77ddf842248ee43…

MALICIOUS

PDF

86.4 KB Created: 2021-07-18 08:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d931936e47da9ac831f539df1f6f0d8c SHA-1: e616ca184f01c44f1d1073855f1eec6f64a89f4d SHA-256: e77ddf842248ee43139a266423f016f99b909940200be665b379a65beb37c431
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links pointing to external PDF files hosted on compromised WordPress sites and other disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and the nature of the embedded links align with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://3e-machinery.ru/app/webroot/filesfiles/39154943024.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607586fc3cb9c---kupobasid.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/85843572183.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/xofako.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/bunujufefinulavixewopike.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/govogikozavo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6564af0d5205749b9ee087874277e5c7/xuvejofemu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gb4esgrvud1shentn403u2btaj/kapesorezirarubike.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0f1942fe766aecee4d1cf3d16e4c9325/zukovidupexesuz.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/422b2e0830363b3428b3a54feaf6485e/fetizok.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/bunasikuvositozupidewu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/nukigo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9d4c8d6914e1f29a6f2e2f94761e9350/pogebuvinijor.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/97206fe244c693ec719c6dcc84d0af16/tufevudo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/blockcv2b2mf3le52biih6amo1/mupofobesufidilowub.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0318b5d6b8---5338162306.pdfIn PDF document text
    • http://jngf.cn/files/file/dodebuzunagem.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f0e257fddbeb6fcfee5cded31faf7887/39523244877.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/19256046835.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/84694484573.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b618b96d9b43e672800ab0968f88b533/fafagazexozipoxowudije.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210617_4E320404128ED865.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe72be9e62---xosujolupup.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5571a76ed3---90025582830.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/24306043284.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/70000942260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ict+full+meaningPDF 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_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10344 bytes
SHA-256: 218dd0b228db48a4641375728e10b32e276f965597455900a847094a077c8175
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 17752 bytes
SHA-256: 14b359d375db5240527a5c07ea5eaf6b3edeca80b6523ee126f268cd2e4aaf00
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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