Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed71bc229689c71…

MALICIOUS

PDF

115.2 KB Created: 2021-09-07 12:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d2a91ae5b5ce3b21d69fcee39616612 SHA-1: a3f3193e61981b9d35d75d4a96b12106bc94dd06 SHA-256: 8ed71bc229689c715f0ba4419cda4013f33c6512ea7f5f36a2b0edfc419f4740
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://allytemp.ru/uplcv?utm_term=2015+prius+2+manual PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd7eeaa2a---joziserefisozapiv.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5df9462643---xufabusageda.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/69319456294.pdfIn PDF document text
    • http://ruihuitax.com/files/file/62804770413.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/nasavegemiduwupavofunux.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b8fdbb817---detagaga.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/lusalojofax.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/xirilag.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609677204e256---68371596975.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/rasutavadeset.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8869893cfc---setomasipiv.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/56594343444.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e37d43c58856bb6fa905034365829f44/20914056656.pdfIn PDF document text
    • https://rosycaffe.com/file/63031457344.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/94676120260.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pufedigaxatugexe.pdfIn PDF document text
    • https://pindimana.in/uploads/file/65443284442.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/butagubopekuvonivo.pdfIn PDF document text
    • https://codecs.roimages/file/joperumepumowe.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/77338238881.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161000206f0e2d---potisiruvoxul.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/49363343514.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/funugenitapilamazavami.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_off00015a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A1 10492 bytes
SHA-256: 05fd1c183729802b5712a72eab9b2d3ef57b717c1c9ed9cbc937c1965e466d50
font_02_sfnt_off00018a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A79 19828 bytes
SHA-256: b39374d901adb50afd6c5976b8ca178d3e40dd2a873f253ef8865fcc39096489

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